commit 42d20cb0ed8d5ac9a981ac80ade12ae8833e96c0
Author: Hussar <bearded@beardedhussar.io>
Date:   Sun Apr 12 15:35:50 2026 +0000

    first commit

diff --git a/fog/.devcontainer/devcontainer.json b/fog/.devcontainer/devcontainer.json
new file mode 100755
index 0000000..7a250b9
--- /dev/null
+++ b/fog/.devcontainer/devcontainer.json
@@ -0,0 +1,33 @@
+{
+  "name": "fog-expedition-devcontainer",
+  "dockerComposeFile": [
+    "../docker-compose.yml",
+    "docker-compose.devcontainer.yml"
+  ],
+  "service": "workspace",
+  "workspaceFolder": "/workspaces/fog",
+  "runServices": ["workspace", "postgres", "redis"],
+  "shutdownAction": "stopCompose",
+  "remoteUser": "node",
+  "features": {
+    "ghcr.io/devcontainers/features/docker-outside-of-docker:1": {}
+  },
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "nrwl.angular-console",
+        "angular.ng-template",
+        "esbenp.prettier-vscode",
+        "dbaeumer.vscode-eslint",
+        "Prisma.prisma"
+      ],
+      "settings": {
+        "editor.formatOnSave": true,
+        "files.eol": "\n"
+      }
+    }
+  },
+  "forwardPorts": [3333, 4200, 5432, 6379],
+  "postCreateCommand": "npm install",
+  "postStartCommand": "echo 'Devcontainer ready. Run: npm run start:api and npm run start:panel'"
+}
diff --git a/fog/.devcontainer/docker-compose.devcontainer.yml b/fog/.devcontainer/docker-compose.devcontainer.yml
new file mode 100755
index 0000000..c2e718b
--- /dev/null
+++ b/fog/.devcontainer/docker-compose.devcontainer.yml
@@ -0,0 +1,13 @@
+version: "3.9"
+
+services:
+  workspace:
+    image: mcr.microsoft.com/devcontainers/javascript-node:1-20-bookworm
+    command: sleep infinity
+    volumes:
+      - ..:/workspaces/fog:cached
+    depends_on:
+      postgres:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
diff --git a/fog/.env b/fog/.env
new file mode 100755
index 0000000..22169e1
--- /dev/null
+++ b/fog/.env
@@ -0,0 +1,6 @@
+DATABASE_URL="postgresql://postgres:postgres@postgres:5432/fog_expedition"
+REDIS_URL="redis://redis:6379"
+TWITCH_EXTENSION_CLIENT_ID="replace-me"
+TWITCH_EXTENSION_SECRET="replace-me"
+TWITCH_EXTENSION_OWNER_ID="replace-me"
+PORT=3333
diff --git a/fog/.env.example b/fog/.env.example
new file mode 100755
index 0000000..b852ed6
--- /dev/null
+++ b/fog/.env.example
@@ -0,0 +1,6 @@
+DATABASE_URL="postgresql://postgres:postgres@localhost:5432/fog_expedition"
+REDIS_URL="redis://localhost:6379"
+TWITCH_EXTENSION_CLIENT_ID="replace-me"
+TWITCH_EXTENSION_SECRET="replace-me"
+TWITCH_EXTENSION_OWNER_ID="replace-me"
+PORT=3333
diff --git a/fog/README.md b/fog/README.md
new file mode 100755
index 0000000..d6866ac
--- /dev/null
+++ b/fog/README.md
@@ -0,0 +1,36 @@
+# Fog Expedition Monorepo
+
+Nx-style monorepo scaffolding for:
+
+- `apps/twitch-extension-panel` (Angular viewer panel)
+- `apps/broadcaster-config` (Angular broadcaster config view)
+- `apps/api` (NestJS EBS API + tick engine)
+- `libs/api-interfaces` (shared contracts)
+- `libs/mission-logic` (encounter resolver + simulator CLI)
+- `libs/encounter-library` (encounter content + schema validation)
+
+## Quick start
+
+1. Install Node.js 20+
+2. Run `npm install`
+3. Copy `.env.example` to `.env` and fill values
+4. Start infra with `docker compose up -d postgres redis`
+5. Run `npm run start:api` and `npm run start:panel`
+
+## Useful commands
+
+- `npm run start:local-dev` - starts panel with Twitch mock mode enabled
+- `npm run simulate` - runs mission balance simulation
+- `nx run encounter-library:validate` - validates encounter JSON schema
+
+## Devcontainer
+
+- Reopen this folder in a devcontainer (VS Code/Cursor command: "Reopen in Container").
+- The container uses `.devcontainer/devcontainer.json` and starts:
+  - `workspace` service (Node 20)
+  - `postgres`
+  - `redis`
+- Dependencies are installed automatically via `postCreateCommand` (`npm install`).
+- After the container starts, run:
+  - `npm run start:api`
+  - `npm run start:panel`
diff --git a/fog/apps/api/Dockerfile b/fog/apps/api/Dockerfile
new file mode 100755
index 0000000..d38027e
--- /dev/null
+++ b/fog/apps/api/Dockerfile
@@ -0,0 +1,10 @@
+FROM node:20-alpine AS base
+WORKDIR /workspace
+
+COPY package.json ./
+RUN npm install --legacy-peer-deps && npm install --legacy-peer-deps --no-save tsx pino-http
+
+COPY . .
+
+EXPOSE 3333
+CMD ["npx", "tsx", "--tsconfig", "apps/api/tsconfig.app.json", "apps/api/src/main.ts"]
diff --git a/fog/apps/api/prisma/schema.prisma b/fog/apps/api/prisma/schema.prisma
new file mode 100755
index 0000000..2a14e1a
--- /dev/null
+++ b/fog/apps/api/prisma/schema.prisma
@@ -0,0 +1,52 @@
+generator client {
+  provider = "prisma-client-js"
+}
+
+datasource db {
+  provider = "postgresql"
+  url      = env("DATABASE_URL")
+}
+
+model User {
+  id            String     @id @default(uuid())
+  twitchUserId  String     @unique
+  createdAt     DateTime   @default(now())
+  survivors     Survivor[]
+}
+
+model Survivor {
+  id            String      @id @default(uuid())
+  userId        String
+  user          User        @relation(fields: [userId], references: [id])
+  health        Int         @default(100)
+  stealth       Int         @default(10)
+  teamwork      Int         @default(10)
+  luck          Int         @default(10)
+  state         String      @default("Active")
+  sacrificedAt  DateTime?
+  missions      Mission[]
+}
+
+model Mission {
+  id            String      @id @default(uuid())
+  survivorId    String
+  survivor      Survivor    @relation(fields: [survivorId], references: [id])
+  status        String
+  difficulty    String
+  createdAt     DateTime    @default(now())
+  completedAt   DateTime?
+  logs          MissionLog[]
+}
+
+model MissionLog {
+  id            String    @id @default(uuid())
+  missionId     String
+  mission       Mission   @relation(fields: [missionId], references: [id])
+  tickIndex     Int
+  encounterKey  String
+  renderedText  String
+  rngDetails    Json?
+  archivedAt    DateTime?
+
+  @@index([missionId, archivedAt])
+}
diff --git a/fog/apps/api/project.json b/fog/apps/api/project.json
new file mode 100755
index 0000000..590886f
--- /dev/null
+++ b/fog/apps/api/project.json
@@ -0,0 +1,25 @@
+{
+  "name": "api",
+  "$schema": "../../node_modules/nx/schemas/project-schema.json",
+  "sourceRoot": "apps/api/src",
+  "projectType": "application",
+  "targets": {
+    "build": {
+      "executor": "@nx/js:tsc",
+      "outputs": ["{options.outputPath}"],
+      "options": {
+        "outputPath": "dist/apps/api",
+        "main": "apps/api/src/main.ts",
+        "tsConfig": "apps/api/tsconfig.app.json",
+        "assets": ["apps/api/src/assets"]
+      }
+    },
+    "serve": {
+      "executor": "@nx/js:node",
+      "options": {
+        "buildTarget": "api:build"
+      }
+    }
+  },
+  "tags": ["scope:api"]
+}
diff --git a/fog/apps/api/src/app/app.module.ts b/fog/apps/api/src/app/app.module.ts
new file mode 100755
index 0000000..52763ab
--- /dev/null
+++ b/fog/apps/api/src/app/app.module.ts
@@ -0,0 +1,31 @@
+import { Module } from '@nestjs/common';
+import { ConfigModule } from '@nestjs/config';
+import { ScheduleModule } from '@nestjs/schedule';
+import { LoggerModule } from 'nestjs-pino';
+
+import { ChannelConfigModule } from './channel-config/channel-config.module';
+import { MetricsModule } from './metrics/metrics.module';
+import { MissionsModule } from './missions/missions.module';
+import { TickEngineModule } from './tick-engine/tick-engine.module';
+import { TwitchAuthModule } from './twitch-auth/twitch-auth.module';
+import { TwitchPubSubModule } from './twitch-pubsub/twitch-pubsub.module';
+
+@Module({
+  imports: [
+    ConfigModule.forRoot({ isGlobal: true }),
+    ScheduleModule.forRoot(),
+    LoggerModule.forRoot({
+      pinoHttp: {
+        level: process.env.LOG_LEVEL ?? 'info',
+        customProps: () => ({ service: 'fog-api' })
+      }
+    }),
+    TwitchAuthModule,
+    MissionsModule,
+    TickEngineModule,
+    TwitchPubSubModule,
+    ChannelConfigModule,
+    MetricsModule
+  ]
+})
+export class AppModule {}
diff --git a/fog/apps/api/src/app/channel-config/channel-config.controller.ts b/fog/apps/api/src/app/channel-config/channel-config.controller.ts
new file mode 100755
index 0000000..ad68186
--- /dev/null
+++ b/fog/apps/api/src/app/channel-config/channel-config.controller.ts
@@ -0,0 +1,17 @@
+import { Body, Controller, Post, Req, UseGuards } from '@nestjs/common';
+
+import { ChannelConfig } from '@fog-explorer/api-interfaces';
+
+import { TwitchAuthGuard } from '../twitch-auth/twitch-auth.guard';
+import { ChannelConfigService } from './channel-config.service';
+
+@Controller('channel')
+@UseGuards(TwitchAuthGuard)
+export class ChannelConfigController {
+  constructor(private readonly configService: ChannelConfigService) {}
+
+  @Post('config')
+  saveChannelConfig(@Body() config: ChannelConfig, @Req() req: any) {
+    return this.configService.saveForChannel(req.viewer.channelId, config);
+  }
+}
diff --git a/fog/apps/api/src/app/channel-config/channel-config.module.ts b/fog/apps/api/src/app/channel-config/channel-config.module.ts
new file mode 100755
index 0000000..219b5b0
--- /dev/null
+++ b/fog/apps/api/src/app/channel-config/channel-config.module.ts
@@ -0,0 +1,11 @@
+import { Module } from '@nestjs/common';
+
+import { ChannelConfigController } from './channel-config.controller';
+import { ChannelConfigService } from './channel-config.service';
+
+@Module({
+  providers: [ChannelConfigService],
+  controllers: [ChannelConfigController],
+  exports: [ChannelConfigService]
+})
+export class ChannelConfigModule {}
diff --git a/fog/apps/api/src/app/channel-config/channel-config.service.ts b/fog/apps/api/src/app/channel-config/channel-config.service.ts
new file mode 100755
index 0000000..9ac9ecd
--- /dev/null
+++ b/fog/apps/api/src/app/channel-config/channel-config.service.ts
@@ -0,0 +1,23 @@
+import { Injectable } from '@nestjs/common';
+
+import { ChannelConfig, MissionDifficulty } from '@fog-explorer/api-interfaces';
+
+@Injectable()
+export class ChannelConfigService {
+  private readonly inMemoryConfigs = new Map<string, ChannelConfig>();
+
+  async saveForChannel(channelId: string, config: ChannelConfig): Promise<ChannelConfig> {
+    const resolved: ChannelConfig = {
+      ...config,
+      channelId,
+      difficultyPreset: config.difficultyPreset ?? MissionDifficulty.Normal,
+      maxPartySize: config.maxPartySize ?? 4
+    };
+    this.inMemoryConfigs.set(channelId, resolved);
+    return resolved;
+  }
+
+  async getForChannel(channelId: string): Promise<ChannelConfig | null> {
+    return this.inMemoryConfigs.get(channelId) ?? null;
+  }
+}
diff --git a/fog/apps/api/src/app/metrics/metrics.controller.ts b/fog/apps/api/src/app/metrics/metrics.controller.ts
new file mode 100755
index 0000000..84932ec
--- /dev/null
+++ b/fog/apps/api/src/app/metrics/metrics.controller.ts
@@ -0,0 +1,13 @@
+import { Controller, Get } from '@nestjs/common';
+
+import { MetricsService } from './metrics.service';
+
+@Controller('metrics')
+export class MetricsController {
+  constructor(private readonly metricsService: MetricsService) {}
+
+  @Get()
+  getMetrics() {
+    return this.metricsService.snapshot();
+  }
+}
diff --git a/fog/apps/api/src/app/metrics/metrics.module.ts b/fog/apps/api/src/app/metrics/metrics.module.ts
new file mode 100755
index 0000000..85a2001
--- /dev/null
+++ b/fog/apps/api/src/app/metrics/metrics.module.ts
@@ -0,0 +1,11 @@
+import { Module } from '@nestjs/common';
+
+import { MetricsController } from './metrics.controller';
+import { MetricsService } from './metrics.service';
+
+@Module({
+  providers: [MetricsService],
+  controllers: [MetricsController],
+  exports: [MetricsService]
+})
+export class MetricsModule {}
diff --git a/fog/apps/api/src/app/metrics/metrics.service.ts b/fog/apps/api/src/app/metrics/metrics.service.ts
new file mode 100755
index 0000000..346cac1
--- /dev/null
+++ b/fog/apps/api/src/app/metrics/metrics.service.ts
@@ -0,0 +1,14 @@
+import { Injectable } from '@nestjs/common';
+
+@Injectable()
+export class MetricsService {
+  private readonly counters = new Map<string, number>();
+
+  increment(name: string, by = 1): void {
+    this.counters.set(name, (this.counters.get(name) ?? 0) + by);
+  }
+
+  snapshot(): Record<string, number> {
+    return Object.fromEntries(this.counters.entries());
+  }
+}
diff --git a/fog/apps/api/src/app/missions/dto.ts b/fog/apps/api/src/app/missions/dto.ts
new file mode 100755
index 0000000..5278870
--- /dev/null
+++ b/fog/apps/api/src/app/missions/dto.ts
@@ -0,0 +1,36 @@
+import { IsArray, IsEnum, IsInt, IsOptional, IsString, Max, Min } from 'class-validator';
+
+import { MissionDifficulty } from '@fog-explorer/api-interfaces';
+
+export class StartMissionDto {
+  @IsString()
+  survivorId!: string;
+
+  @IsEnum(MissionDifficulty)
+  difficulty!: MissionDifficulty;
+
+  @IsArray()
+  @IsString({ each: true })
+  @IsOptional()
+  perkIds?: string[];
+}
+
+export class ChoosePerkDto {
+  @IsString()
+  missionId!: string;
+
+  @IsString()
+  perkId!: string;
+}
+
+export class StateQueryDto {
+  @IsString()
+  @IsOptional()
+  missionId?: string;
+
+  @IsInt()
+  @Min(1)
+  @Max(20)
+  @IsOptional()
+  recentLogLines?: number = 12;
+}
diff --git a/fog/apps/api/src/app/missions/mission-log-archival.job.ts b/fog/apps/api/src/app/missions/mission-log-archival.job.ts
new file mode 100755
index 0000000..563a9dd
--- /dev/null
+++ b/fog/apps/api/src/app/missions/mission-log-archival.job.ts
@@ -0,0 +1,18 @@
+import { Injectable, Logger } from '@nestjs/common';
+import { Cron } from '@nestjs/schedule';
+
+@Injectable()
+export class MissionLogArchivalJob {
+  private readonly logger = new Logger(MissionLogArchivalJob.name);
+
+  @Cron('0 3 * * *')
+  async archiveOldLogs(): Promise<void> {
+    // Placeholder for a DB archival statement such as:
+    // UPDATE mission_logs SET archived_at = NOW()
+    // WHERE archived_at IS NULL AND mission_id IN (...) AND created_at < NOW() - interval '14 days'
+    this.logger.log({
+      event: 'mission_log_archival_run',
+      message: 'Nightly archival job executed.'
+    });
+  }
+}
diff --git a/fog/apps/api/src/app/missions/mission.store.ts b/fog/apps/api/src/app/missions/mission.store.ts
new file mode 100755
index 0000000..da908ac
--- /dev/null
+++ b/fog/apps/api/src/app/missions/mission.store.ts
@@ -0,0 +1,62 @@
+import { Injectable } from '@nestjs/common';
+import Redis from 'ioredis';
+
+import { MissionSnapshot } from '@fog-explorer/api-interfaces';
+
+@Injectable()
+export class MissionStore {
+  private readonly redis: Redis;
+
+  constructor() {
+    this.redis = new Redis(process.env.REDIS_URL ?? 'redis://localhost:6379');
+  }
+
+  async getMission(missionId: string): Promise<MissionSnapshot | null> {
+    const raw = await this.redis.get(this.missionKey(missionId));
+    return raw ? (JSON.parse(raw) as MissionSnapshot) : null;
+  }
+
+  async setMission(mission: MissionSnapshot): Promise<void> {
+    await this.redis.set(
+      this.missionKey(mission.id),
+      JSON.stringify(mission),
+      'EX',
+      60 * 60
+    );
+    await this.redis.sadd('active_missions', mission.id);
+  }
+
+  async listActiveMissionIds(): Promise<string[]> {
+    return this.redis.smembers('active_missions');
+  }
+
+  async getCachedMissionState(cacheKey: string): Promise<MissionSnapshot | null> {
+    const raw = await this.redis.get(cacheKey);
+    return raw ? (JSON.parse(raw) as MissionSnapshot) : null;
+  }
+
+  async cacheMissionState(
+    cacheKey: string,
+    mission: MissionSnapshot,
+    ttlSeconds = 3
+  ): Promise<void> {
+    await this.redis.set(cacheKey, JSON.stringify(mission), 'EX', ttlSeconds);
+  }
+
+  async getMissionTickSequence(missionId: string): Promise<number> {
+    const raw = await this.redis.get(this.tickSeqKey(missionId));
+    return Number(raw ?? 0);
+  }
+
+  async setMissionTickSequence(missionId: string, index: number): Promise<void> {
+    await this.redis.set(this.tickSeqKey(missionId), String(index), 'EX', 60 * 60);
+  }
+
+  private missionKey(missionId: string): string {
+    return `active_mission:${missionId}`;
+  }
+
+  private tickSeqKey(missionId: string): string {
+    return `active_mission:${missionId}:tick_seq`;
+  }
+}
diff --git a/fog/apps/api/src/app/missions/missions.controller.ts b/fog/apps/api/src/app/missions/missions.controller.ts
new file mode 100755
index 0000000..014d0be
--- /dev/null
+++ b/fog/apps/api/src/app/missions/missions.controller.ts
@@ -0,0 +1,31 @@
+import { Body, Controller, Get, Post, Query, Req, UseGuards } from '@nestjs/common';
+
+import { TwitchAuthGuard } from '../twitch-auth/twitch-auth.guard';
+import { ChoosePerkDto, StartMissionDto, StateQueryDto } from './dto';
+import { MissionsService } from './missions.service';
+
+@Controller('missions')
+@UseGuards(TwitchAuthGuard)
+export class MissionsController {
+  constructor(private readonly missionsService: MissionsService) {}
+
+  @Post('start')
+  startMission(@Body() dto: StartMissionDto, @Req() req: any) {
+    return this.missionsService.startMission({
+      survivorId: dto.survivorId,
+      difficulty: dto.difficulty,
+      channelId: req.viewer.channelId,
+      perkIds: dto.perkIds
+    });
+  }
+
+  @Get('state')
+  getState(@Query() query: StateQueryDto) {
+    return this.missionsService.getMissionState(query.missionId ?? '', query.recentLogLines);
+  }
+
+  @Post('choose-perk')
+  choosePerk(@Body() dto: ChoosePerkDto) {
+    return this.missionsService.choosePerk(dto.missionId, dto.perkId);
+  }
+}
diff --git a/fog/apps/api/src/app/missions/missions.module.ts b/fog/apps/api/src/app/missions/missions.module.ts
new file mode 100755
index 0000000..6b960a1
--- /dev/null
+++ b/fog/apps/api/src/app/missions/missions.module.ts
@@ -0,0 +1,16 @@
+import { Module } from '@nestjs/common';
+
+import { ChannelConfigModule } from '../channel-config/channel-config.module';
+import { TwitchPubSubModule } from '../twitch-pubsub/twitch-pubsub.module';
+import { MissionStore } from './mission.store';
+import { MissionLogArchivalJob } from './mission-log-archival.job';
+import { MissionsController } from './missions.controller';
+import { MissionsService } from './missions.service';
+
+@Module({
+  imports: [TwitchPubSubModule, ChannelConfigModule],
+  providers: [MissionsService, MissionStore, MissionLogArchivalJob],
+  controllers: [MissionsController],
+  exports: [MissionsService, MissionStore]
+})
+export class MissionsModule {}
diff --git a/fog/apps/api/src/app/missions/missions.service.ts b/fog/apps/api/src/app/missions/missions.service.ts
new file mode 100755
index 0000000..8efa489
--- /dev/null
+++ b/fog/apps/api/src/app/missions/missions.service.ts
@@ -0,0 +1,107 @@
+import { randomUUID } from 'node:crypto';
+
+import { Injectable, NotFoundException } from '@nestjs/common';
+
+import {
+  EncounterLogLine,
+  MissionDifficulty,
+  MissionSnapshot,
+  MissionState
+} from '@fog-explorer/api-interfaces';
+import { resolveEncounter } from '@fog-explorer/mission-logic';
+
+import { ChannelConfigService } from '../channel-config/channel-config.service';
+import { TwitchPubSubService } from '../twitch-pubsub/twitch-pubsub.service';
+import { MissionStore } from './mission.store';
+
+@Injectable()
+export class MissionsService {
+  constructor(
+    private readonly store: MissionStore,
+    private readonly pubsub: TwitchPubSubService,
+    private readonly channelConfig: ChannelConfigService
+  ) {}
+
+  async startMission(input: {
+    survivorId: string;
+    channelId: string;
+    difficulty: MissionDifficulty;
+    perkIds?: string[];
+  }): Promise<MissionSnapshot> {
+    const config = await this.channelConfig.getForChannel(input.channelId);
+    const missionId = randomUUID();
+    const mission: MissionSnapshot = {
+      id: missionId,
+      channelId: input.channelId,
+      survivorId: input.survivorId,
+      state: MissionState.InProgress,
+      difficulty: config?.difficultyPreset ?? input.difficulty,
+      tickIndex: 0,
+      recentLog: [],
+      stats: {
+        health: 100,
+        stealth: 10,
+        teamwork: 10,
+        luck: 10
+      },
+      perkIds: input.perkIds ?? []
+    };
+    await this.store.setMission(mission);
+    return mission;
+  }
+
+  async getMissionState(missionId: string, recentLogLines = 12): Promise<MissionSnapshot> {
+    const cacheKey = `mission_state:${missionId}`;
+    const cached = await this.store.getCachedMissionState(cacheKey);
+    if (cached) {
+      return cached;
+    }
+
+    const mission = await this.store.getMission(missionId);
+    if (!mission) {
+      throw new NotFoundException(`Mission ${missionId} not found`);
+    }
+    mission.recentLog = mission.recentLog.slice(-recentLogLines);
+    await this.store.cacheMissionState(cacheKey, mission, 3);
+    return mission;
+  }
+
+  async resolveMissionTick(missionId: string, tickIndex: number): Promise<MissionSnapshot | null> {
+    const mission = await this.store.getMission(missionId);
+    if (!mission || mission.state !== MissionState.InProgress) {
+      return null;
+    }
+
+    const lastResolved = await this.store.getMissionTickSequence(missionId);
+    if (lastResolved >= tickIndex) {
+      return mission;
+    }
+
+    const result = resolveEncounter({
+      stats: mission.stats,
+      difficulty: mission.difficulty,
+      perkIds: mission.perkIds,
+      tickIndex
+    });
+    const logLine: EncounterLogLine = {
+      sequence: tickIndex,
+      event: result.outcome,
+      text: result.text,
+      successChance: result.successChance,
+      roll: result.roll
+    };
+    mission.tickIndex = tickIndex;
+    mission.recentLog = [...mission.recentLog, logLine].slice(-15);
+    mission.state = result.nextState;
+    mission.stats = result.nextStats;
+
+    await this.store.setMission(mission);
+    await this.store.setMissionTickSequence(missionId, tickIndex);
+    await this.pubsub.publishMissionUpdate(mission.channelId, mission);
+    return mission;
+  }
+
+  async choosePerk(_missionId: string, _perkId: string): Promise<{ accepted: boolean }> {
+    return { accepted: true };
+  }
+}
diff --git a/fog/apps/api/src/app/tick-engine/tick-engine.module.ts b/fog/apps/api/src/app/tick-engine/tick-engine.module.ts
new file mode 100755
index 0000000..96b93e6
--- /dev/null
+++ b/fog/apps/api/src/app/tick-engine/tick-engine.module.ts
@@ -0,0 +1,10 @@
+import { Module } from '@nestjs/common';
+
+import { MissionsModule } from '../missions/missions.module';
+import { TickService } from './tick.service';
+
+@Module({
+  imports: [MissionsModule],
+  providers: [TickService]
+})
+export class TickEngineModule {}
diff --git a/fog/apps/api/src/app/tick-engine/tick.service.ts b/fog/apps/api/src/app/tick-engine/tick.service.ts
new file mode 100755
index 0000000..0d7782e
--- /dev/null
+++ b/fog/apps/api/src/app/tick-engine/tick.service.ts
@@ -0,0 +1,63 @@
+import { Injectable, Logger } from '@nestjs/common';
+import { Cron, CronExpression } from '@nestjs/schedule';
+import Redis from 'ioredis';
+
+import { MissionStore } from '../missions/mission.store';
+import { MissionsService } from '../missions/missions.service';
+
+@Injectable()
+export class TickService {
+  private readonly logger = new Logger(TickService.name);
+  private readonly redis: Redis;
+
+  constructor(
+    private readonly missionStore: MissionStore,
+    private readonly missionsService: MissionsService
+  ) {
+    this.redis = new Redis(process.env.REDIS_URL ?? 'redis://localhost:6379');
+  }
+
+  @Cron(CronExpression.EVERY_MINUTE)
+  async runGlobalTick(): Promise<void> {
+    const tickStarted = Date.now();
+    const tickIndex = Math.floor(tickStarted / 60000);
+    const lockKey = 'tick_lock';
+    const lockToken = String(tickStarted);
+
+    const lockAcquired = await this.redis.set(lockKey, lockToken, 'NX', 'EX', 50);
+    if (!lockAcquired) {
+      this.logger.warn({
+        event: 'tick_lock_busy',
+        tickIndex
+      });
+      return;
+    }
+
+    try {
+      const missionIds = await this.missionStore.listActiveMissionIds();
+      let processed = 0;
+      for (const missionId of missionIds) {
+        await this.missionsService.resolveMissionTick(missionId, tickIndex);
+        processed += 1;
+      }
+      const durationMs = Date.now() - tickStarted;
+      this.logger.log({
+        event: 'tick_complete',
+        tickIndex,
+        durationMs,
+        activeMissionCount: missionIds.length,
+        processedMissionCount: processed
+      });
+    } finally {
+      const current = await this.redis.get(lockKey);
+      if (current === lockToken) {
+        await this.redis.del(lockKey);
+      } else {
+        this.logger.warn({
+          event: 'tick_lock_expired_before_release',
+          tickIndex
+        });
+      }
+    }
+  }
+}
diff --git a/fog/apps/api/src/app/twitch-auth/twitch-auth.guard.ts b/fog/apps/api/src/app/twitch-auth/twitch-auth.guard.ts
new file mode 100755
index 0000000..63490ac
--- /dev/null
+++ b/fog/apps/api/src/app/twitch-auth/twitch-auth.guard.ts
@@ -0,0 +1,51 @@
+import {
+  CanActivate,
+  ExecutionContext,
+  Injectable,
+  UnauthorizedException
+} from '@nestjs/common';
+import { JwtService } from '@nestjs/jwt';
+
+import { TwitchSecretService } from './twitch-secret.service';
+
+@Injectable()
+export class TwitchAuthGuard implements CanActivate {
+  private readonly jwt = new JwtService();
+
+  constructor(private readonly secretService: TwitchSecretService) {}
+
+  async canActivate(context: ExecutionContext): Promise<boolean> {
+    const req = context.switchToHttp().getRequest();
+    const authHeader = req.headers.authorization ?? '';
+    const token = authHeader.startsWith('Bearer ')
+      ? authHeader.replace('Bearer ', '')
+      : '';
+
+    if (!token) {
+      throw new UnauthorizedException('Missing Twitch extension JWT');
+    }
+
+    const payload = await this.verifyWithRotation(token);
+    req.viewer = {
+      userId: payload.user_id ?? payload.opaque_user_id ?? 'anonymous',
+      channelId: payload.channel_id ?? 'unknown'
+    };
+    return true;
+  }
+
+  private async verifyWithRotation(token: string): Promise<Record<string, unknown>> {
+    const firstSecret = await this.secretService.getCurrentSecret(false);
+    try {
+      return this.jwt.verify(token, { secret: firstSecret }) as Record<string, unknown>;
+    } catch {
+      const refreshedSecret = await this.secretService.getCurrentSecret(true);
+      try {
+        return this.jwt.verify(token, {
+          secret: refreshedSecret
+        }) as Record<string, unknown>;
+      } catch {
+        throw new UnauthorizedException('Invalid Twitch extension JWT');
+      }
+    }
+  }
+}
diff --git a/fog/apps/api/src/app/twitch-auth/twitch-auth.module.ts b/fog/apps/api/src/app/twitch-auth/twitch-auth.module.ts
new file mode 100755
index 0000000..22289ca
--- /dev/null
+++ b/fog/apps/api/src/app/twitch-auth/twitch-auth.module.ts
@@ -0,0 +1,12 @@
+import { Module } from '@nestjs/common';
+import { ConfigModule } from '@nestjs/config';
+
+import { TwitchAuthGuard } from './twitch-auth.guard';
+import { TwitchSecretService } from './twitch-secret.service';
+
+@Module({
+  imports: [ConfigModule],
+  providers: [TwitchSecretService, TwitchAuthGuard],
+  exports: [TwitchAuthGuard, TwitchSecretService]
+})
+export class TwitchAuthModule {}
diff --git a/fog/apps/api/src/app/twitch-auth/twitch-secret.service.ts b/fog/apps/api/src/app/twitch-auth/twitch-secret.service.ts
new file mode 100755
index 0000000..f3728cb
--- /dev/null
+++ b/fog/apps/api/src/app/twitch-auth/twitch-secret.service.ts
@@ -0,0 +1,39 @@
+import { Injectable, Logger } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+
+interface CachedSecret {
+  value: string;
+  expiresAt: number;
+}
+
+@Injectable()
+export class TwitchSecretService {
+  private readonly logger = new Logger(TwitchSecretService.name);
+  private cachedSecret: CachedSecret | null = null;
+
+  constructor(private readonly configService: ConfigService) {}
+
+  async getCurrentSecret(forceRefresh = false): Promise<string> {
+    const now = Date.now();
+    if (!forceRefresh && this.cachedSecret && this.cachedSecret.expiresAt > now) {
+      return this.cachedSecret.value;
+    }
+
+    const refreshed = await this.fetchSecretFromTwitchApi();
+    this.cachedSecret = {
+      value: refreshed,
+      expiresAt: now + 5 * 60 * 1000
+    };
+    return refreshed;
+  }
+
+  private async fetchSecretFromTwitchApi(): Promise<string> {
+    // Placeholder for real Twitch API call.
+    // For local development this falls back to env secret.
+    this.logger.warn({
+      event: 'twitch_secret_refetch',
+      message: 'Refreshing Twitch extension secret after verification failure.'
+    });
+    return this.configService.get<string>('TWITCH_EXTENSION_SECRET', 'replace-me');
+  }
+}
diff --git a/fog/apps/api/src/app/twitch-pubsub/twitch-pubsub.module.ts b/fog/apps/api/src/app/twitch-pubsub/twitch-pubsub.module.ts
new file mode 100755
index 0000000..9f6275e
--- /dev/null
+++ b/fog/apps/api/src/app/twitch-pubsub/twitch-pubsub.module.ts
@@ -0,0 +1,9 @@
+import { Module } from '@nestjs/common';
+
+import { TwitchPubSubService } from './twitch-pubsub.service';
+
+@Module({
+  providers: [TwitchPubSubService],
+  exports: [TwitchPubSubService]
+})
+export class TwitchPubSubModule {}
diff --git a/fog/apps/api/src/app/twitch-pubsub/twitch-pubsub.service.ts b/fog/apps/api/src/app/twitch-pubsub/twitch-pubsub.service.ts
new file mode 100755
index 0000000..dbb7436
--- /dev/null
+++ b/fog/apps/api/src/app/twitch-pubsub/twitch-pubsub.service.ts
@@ -0,0 +1,25 @@
+import { Injectable, Logger } from '@nestjs/common';
+
+import { MissionSnapshot } from '@fog-explorer/api-interfaces';
+
+@Injectable()
+export class TwitchPubSubService {
+  private readonly logger = new Logger(TwitchPubSubService.name);
+
+  async publishMissionUpdate(channelId: string, mission: MissionSnapshot): Promise<void> {
+    const payload = {
+      sequence: mission.tickIndex,
+      missionId: mission.id,
+      recentLog: mission.recentLog.slice(-12),
+      state: mission.state
+    };
+
+    // Placeholder: replace with Twitch EBS PubSub API call.
+    this.logger.log({
+      event: 'pubsub_publish',
+      channelId,
+      missionId: mission.id,
+      bytes: JSON.stringify(payload).length
+    });
+  }
+}
diff --git a/fog/apps/api/src/assets/.gitkeep b/fog/apps/api/src/assets/.gitkeep
new file mode 100755
index 0000000..d3f5a12
--- /dev/null
+++ b/fog/apps/api/src/assets/.gitkeep
@@ -0,0 +1 @@
+
diff --git a/fog/apps/api/src/main.ts b/fog/apps/api/src/main.ts
new file mode 100755
index 0000000..6b7bc24
--- /dev/null
+++ b/fog/apps/api/src/main.ts
@@ -0,0 +1,23 @@
+import { ValidationPipe } from '@nestjs/common';
+import { NestFactory } from '@nestjs/core';
+import { Logger } from 'nestjs-pino';
+
+import { AppModule } from './app/app.module';
+
+async function bootstrap(): Promise<void> {
+  const app = await NestFactory.create(AppModule, { bufferLogs: true });
+  app.useGlobalPipes(
+    new ValidationPipe({
+      whitelist: true,
+      transform: true,
+      forbidNonWhitelisted: true
+    })
+  );
+
+  app.useLogger(app.get(Logger));
+
+  const port = Number(process.env.PORT ?? 3333);
+  await app.listen(port);
+}
+
+bootstrap();
diff --git a/fog/apps/api/tsconfig.app.json b/fog/apps/api/tsconfig.app.json
new file mode 100755
index 0000000..c2aa86d
--- /dev/null
+++ b/fog/apps/api/tsconfig.app.json
@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "../../dist/out-tsc",
+    "module": "CommonJS",
+    "types": ["node"]
+  },
+  "include": ["src/**/*.ts"]
+}
diff --git a/fog/apps/broadcaster-config/project.json b/fog/apps/broadcaster-config/project.json
new file mode 100755
index 0000000..39ea480
--- /dev/null
+++ b/fog/apps/broadcaster-config/project.json
@@ -0,0 +1,26 @@
+{
+  "name": "broadcaster-config",
+  "$schema": "../../node_modules/nx/schemas/project-schema.json",
+  "sourceRoot": "apps/broadcaster-config/src",
+  "projectType": "application",
+  "targets": {
+    "build": {
+      "executor": "@nx/angular:application",
+      "options": {
+        "outputPath": "dist/apps/broadcaster-config",
+        "index": "apps/broadcaster-config/src/index.html",
+        "browser": "apps/broadcaster-config/src/main.ts",
+        "tsConfig": "apps/broadcaster-config/tsconfig.app.json",
+        "assets": [],
+        "styles": []
+      }
+    },
+    "serve": {
+      "executor": "@nx/angular:dev-server",
+      "options": {
+        "buildTarget": "broadcaster-config:build"
+      }
+    }
+  },
+  "tags": ["scope:panel"]
+}
diff --git a/fog/apps/broadcaster-config/src/index.html b/fog/apps/broadcaster-config/src/index.html
new file mode 100755
index 0000000..97a6e34
--- /dev/null
+++ b/fog/apps/broadcaster-config/src/index.html
@@ -0,0 +1,11 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <title>Fog Broadcaster Config</title>
+  </head>
+  <body>
+    <fog-broadcaster-config></fog-broadcaster-config>
+  </body>
+  </html>
diff --git a/fog/apps/broadcaster-config/src/main.ts b/fog/apps/broadcaster-config/src/main.ts
new file mode 100755
index 0000000..833d668
--- /dev/null
+++ b/fog/apps/broadcaster-config/src/main.ts
@@ -0,0 +1,45 @@
+import { CommonModule } from '@angular/common';
+import { HttpClient, provideHttpClient } from '@angular/common/http';
+import { Component, inject } from '@angular/core';
+import { FormsModule } from '@angular/forms';
+import { bootstrapApplication } from '@angular/platform-browser';
+
+import { MissionDifficulty } from '@fog-explorer/api-interfaces';
+
+@Component({
+  selector: 'fog-broadcaster-config',
+  standalone: true,
+  imports: [CommonModule, FormsModule],
+  template: `
+    <h2>Fog Broadcaster Config</h2>
+    <label>Difficulty</label>
+    <select [(ngModel)]="difficulty">
+      <option *ngFor="let d of difficulties" [value]="d">{{ d }}</option>
+    </select>
+    <label>Max party size</label>
+    <input type="number" [(ngModel)]="maxPartySize" min="1" max="4" />
+    <button (click)="save()">Save</button>
+  `
+})
+class BroadcasterConfigComponent {
+  private readonly http = inject(HttpClient);
+
+  readonly difficulties = Object.values(MissionDifficulty);
+  difficulty: MissionDifficulty = MissionDifficulty.Normal;
+  maxPartySize = 4;
+
+  save(): void {
+    void this.http
+      .post('/channel/config', {
+        channelId: 'from-jwt',
+        difficultyPreset: this.difficulty,
+        maxPartySize: this.maxPartySize,
+        featureFlags: {}
+      })
+      .subscribe();
+  }
+}
+
+bootstrapApplication(BroadcasterConfigComponent, {
+  providers: [provideHttpClient()]
+}).catch((error) => console.error(error));
diff --git a/fog/apps/broadcaster-config/tsconfig.app.json b/fog/apps/broadcaster-config/tsconfig.app.json
new file mode 100755
index 0000000..e879e64
--- /dev/null
+++ b/fog/apps/broadcaster-config/tsconfig.app.json
@@ -0,0 +1,8 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "../../dist/out-tsc",
+    "types": []
+  },
+  "include": ["src/**/*.ts"]
+}
diff --git a/fog/apps/twitch-extension-panel/Dockerfile b/fog/apps/twitch-extension-panel/Dockerfile
new file mode 100755
index 0000000..c6edbd8
--- /dev/null
+++ b/fog/apps/twitch-extension-panel/Dockerfile
@@ -0,0 +1,12 @@
+FROM node:20-alpine AS build
+WORKDIR /workspace
+
+COPY package.json ./
+RUN npm install
+
+COPY . .
+RUN npx nx build twitch-extension-panel
+
+FROM nginx:alpine
+COPY --from=build /workspace/dist/apps/twitch-extension-panel/browser /usr/share/nginx/html
+EXPOSE 80
diff --git a/fog/apps/twitch-extension-panel/project.json b/fog/apps/twitch-extension-panel/project.json
new file mode 100755
index 0000000..4a5a11d
--- /dev/null
+++ b/fog/apps/twitch-extension-panel/project.json
@@ -0,0 +1,26 @@
+{
+  "name": "twitch-extension-panel",
+  "$schema": "../../node_modules/nx/schemas/project-schema.json",
+  "sourceRoot": "apps/twitch-extension-panel/src",
+  "projectType": "application",
+  "targets": {
+    "build": {
+      "executor": "@nx/angular:application",
+      "options": {
+        "outputPath": "dist/apps/twitch-extension-panel",
+        "index": "apps/twitch-extension-panel/src/index.html",
+        "browser": "apps/twitch-extension-panel/src/main.ts",
+        "tsConfig": "apps/twitch-extension-panel/tsconfig.app.json",
+        "assets": [],
+        "styles": ["apps/twitch-extension-panel/src/styles.css"]
+      }
+    },
+    "serve": {
+      "executor": "@nx/angular:dev-server",
+      "options": {
+        "buildTarget": "twitch-extension-panel:build"
+      }
+    }
+  },
+  "tags": ["scope:panel"]
+}
diff --git a/fog/apps/twitch-extension-panel/src/app/live-log.component.ts b/fog/apps/twitch-extension-panel/src/app/live-log.component.ts
new file mode 100755
index 0000000..50be5e6
--- /dev/null
+++ b/fog/apps/twitch-extension-panel/src/app/live-log.component.ts
@@ -0,0 +1,28 @@
+import { CommonModule } from '@angular/common';
+import { Component, Input } from '@angular/core';
+
+import { EncounterLogLine } from '@fog-explorer/api-interfaces';
+
+@Component({
+  selector: 'fog-live-log',
+  standalone: true,
+  imports: [CommonModule],
+  template: `
+    <section class="panel-card">
+      <h3>Live Log</h3>
+      <div class="log-list">
+        <p *ngFor="let line of lines">#{{ line.sequence }} - {{ line.text }}</p>
+      </div>
+    </section>
+  `,
+  styles: [
+    `
+      .panel-card { padding: 0.75rem; background: #1a1e2a; border-radius: 8px; }
+      .log-list { max-height: 220px; overflow: auto; }
+      p { margin: 0 0 0.5rem; font-size: 0.9rem; }
+    `
+  ]
+})
+export class LiveLogComponent {
+  @Input({ required: true }) lines: EncounterLogLine[] = [];
+}
diff --git a/fog/apps/twitch-extension-panel/src/app/panel-shell.component.ts b/fog/apps/twitch-extension-panel/src/app/panel-shell.component.ts
new file mode 100755
index 0000000..60456b6
--- /dev/null
+++ b/fog/apps/twitch-extension-panel/src/app/panel-shell.component.ts
@@ -0,0 +1,66 @@
+import { CommonModule } from '@angular/common';
+import { Component, OnInit, computed, inject } from '@angular/core';
+
+import { MissionDifficulty } from '@fog-explorer/api-interfaces';
+
+import { EbsApiService } from './services/ebs-api.service';
+import { MissionStateStore } from './services/mission-state.store';
+import { PubSubService } from './services/pubsub.service';
+import { TwitchAuthService } from './services/twitch-auth.service';
+import { LiveLogComponent } from './live-log.component';
+import { SurvivorStatusComponent } from './survivor-status.component';
+
+@Component({
+  selector: 'fog-panel-shell',
+  standalone: true,
+  imports: [CommonModule, LiveLogComponent, SurvivorStatusComponent],
+  template: `
+    <main class="layout">
+      <header>
+        <h2>Fog Expedition</h2>
+        <p *ngIf="reconnecting()">reconnecting...</p>
+      </header>
+      <button (click)="startMission()">Start Mission</button>
+      <fog-survivor-status [mission]="mission()"></fog-survivor-status>
+      <fog-live-log [lines]="logLines()"></fog-live-log>
+    </main>
+  `,
+  styles: [
+    `
+      .layout { display: grid; gap: 0.75rem; padding: 0.75rem; }
+      button { background: #6d28d9; border: 0; color: white; padding: 0.5rem 0.75rem; border-radius: 6px; cursor: pointer; }
+      h2, p { margin: 0; }
+    `
+  ]
+})
+export class PanelShellComponent implements OnInit {
+  private readonly auth = inject(TwitchAuthService);
+  private readonly api = inject(EbsApiService);
+  private readonly store = inject(MissionStateStore);
+  private readonly pubsub = inject(PubSubService);
+
+  readonly mission = this.store.mission;
+  readonly reconnecting = this.store.reconnecting;
+  readonly logLines = computed(() => this.store.logLines());
+
+  ngOnInit(): void {
+    this.auth.init();
+  }
+
+  async startMission(): Promise<void> {
+    const auth = this.auth.auth();
+    if (!auth) {
+      return;
+    }
+    const mission = await this.api.startMission(auth.token, {
+      survivorId: auth.userId,
+      difficulty: MissionDifficulty.Normal
+    });
+    this.store.setMission(mission);
+    this.pubsub.subscribeToMissionUpdates(`mission.${mission.id}`, async () => {
+      this.store.setReconnecting(true);
+      const fresh = await this.api.getMissionState(auth.token, mission.id);
+      this.store.setMission(fresh);
+    });
+  }
+}
diff --git a/fog/apps/twitch-extension-panel/src/app/services/ebs-api.service.ts b/fog/apps/twitch-extension-panel/src/app/services/ebs-api.service.ts
new file mode 100755
index 0000000..bb6c0cb
--- /dev/null
+++ b/fog/apps/twitch-extension-panel/src/app/services/ebs-api.service.ts
@@ -0,0 +1,45 @@
+import { Injectable } from '@angular/core';
+
+import { MissionSnapshot } from '@fog-explorer/api-interfaces';
+
+import { environment } from '../../environments/environment';
+
+@Injectable({ providedIn: 'root' })
+export class EbsApiService {
+  async startMission(token: string, body: { survivorId: string; difficulty: string }) {
+    return this.fetchWithRetry('/missions/start', {
+      method: 'POST',
+      headers: {
+        Authorization: `Bearer ${token}`,
+        'Content-Type': 'application/json'
+      },
+      body: JSON.stringify(body)
+    });
+  }
+
+  async getMissionState(token: string, missionId: string): Promise<MissionSnapshot> {
+    return this.fetchWithRetry(`/missions/state?missionId=${missionId}`, {
+      method: 'GET',
+      headers: {
+        Authorization: `Bearer ${token}`
+      }
+    });
+  }
+
+  private async fetchWithRetry<T>(path: string, init: RequestInit, attempt = 0): Promise<T> {
+    try {
+      const response = await fetch(`${environment.apiBaseUrl}${path}`, init);
+      if (!response.ok) {
+        throw new Error(`HTTP ${response.status}`);
+      }
+      return (await response.json()) as T;
+    } catch (error) {
+      if (attempt >= 4) {
+        throw error;
+      }
+      const delayMs = Math.min(5000, Math.round(350 * 2 ** attempt + Math.random() * 150));
+      await new Promise((resolve) => setTimeout(resolve, delayMs));
+      return this.fetchWithRetry(path, init, attempt + 1);
+    }
+  }
+}
diff --git a/fog/apps/twitch-extension-panel/src/app/services/mission-state.store.ts b/fog/apps/twitch-extension-panel/src/app/services/mission-state.store.ts
new file mode 100755
index 0000000..2c26104
--- /dev/null
+++ b/fog/apps/twitch-extension-panel/src/app/services/mission-state.store.ts
@@ -0,0 +1,19 @@
+import { Injectable, computed, signal } from '@angular/core';
+
+import { MissionSnapshot } from '@fog-explorer/api-interfaces';
+
+@Injectable({ providedIn: 'root' })
+export class MissionStateStore {
+  readonly mission = signal<MissionSnapshot | null>(null);
+  readonly reconnecting = signal(false);
+  readonly logLines = computed(() => this.mission()?.recentLog ?? []);
+
+  setMission(snapshot: MissionSnapshot): void {
+    this.mission.set(snapshot);
+    this.reconnecting.set(false);
+  }
+
+  setReconnecting(value: boolean): void {
+    this.reconnecting.set(value);
+  }
+}
diff --git a/fog/apps/twitch-extension-panel/src/app/services/pubsub.service.ts b/fog/apps/twitch-extension-panel/src/app/services/pubsub.service.ts
new file mode 100755
index 0000000..09a69b7
--- /dev/null
+++ b/fog/apps/twitch-extension-panel/src/app/services/pubsub.service.ts
@@ -0,0 +1,43 @@
+import { Injectable } from '@angular/core';
+
+import { MissionSnapshot } from '@fog-explorer/api-interfaces';
+
+import { MissionStateStore } from './mission-state.store';
+import { TwitchAuthService } from './twitch-auth.service';
+
+interface MissionDeltaMessage {
+  sequence: number;
+  missionId: string;
+  state: string;
+  recentLog: MissionSnapshot['recentLog'];
+}
+
+@Injectable({ providedIn: 'root' })
+export class PubSubService {
+  private lastSequence = 0;
+
+  constructor(
+    private readonly auth: TwitchAuthService,
+    private readonly store: MissionStateStore
+  ) {}
+
+  subscribeToMissionUpdates(topic: string, fullRefetch: () => Promise<void>): void {
+    this.auth.onPubSub(topic, async (_target, _contentType, message) => {
+      const parsed = JSON.parse(message) as MissionDeltaMessage;
+      if (parsed.sequence !== this.lastSequence + 1 && this.lastSequence !== 0) {
+        await fullRefetch();
+      } else {
+        const current = this.store.mission();
+        if (current && current.id === parsed.missionId) {
+          this.store.setMission({
+            ...current,
+            state: parsed.state as MissionSnapshot['state'],
+            recentLog: parsed.recentLog.slice(-15),
+            tickIndex: parsed.sequence
+          });
+        }
+      }
+      this.lastSequence = parsed.sequence;
+    });
+  }
+}
diff --git a/fog/apps/twitch-extension-panel/src/app/services/twitch-auth.service.ts b/fog/apps/twitch-extension-panel/src/app/services/twitch-auth.service.ts
new file mode 100755
index 0000000..51e03af
--- /dev/null
+++ b/fog/apps/twitch-extension-panel/src/app/services/twitch-auth.service.ts
@@ -0,0 +1,47 @@
+import { Injectable, signal } from '@angular/core';
+
+import { twitchExtMock, TwitchExtLike } from '../../mocks/twitch-ext.mock';
+import { environment } from '../../environments/environment';
+
+declare global {
+  interface Window {
+    Twitch?: {
+      ext?: TwitchExtLike;
+    };
+  }
+}
+
+export interface TwitchAuthState {
+  token: string;
+  userId: string;
+}
+
+@Injectable({ providedIn: 'root' })
+export class TwitchAuthService {
+  readonly auth = signal<TwitchAuthState | null>(null);
+
+  init(): void {
+    const ext = this.getExt();
+    ext.onAuthorized(({ token, userId }) => {
+      this.auth.set({ token, userId });
+    });
+  }
+
+  onPubSub(
+    topic: string,
+    callback: (target: string, contentType: string, message: string) => void
+  ): void {
+    this.getExt().listen(topic, callback);
+  }
+
+  private getExt(): TwitchExtLike {
+    if (environment.mock) {
+      return twitchExtMock;
+    }
+    const ext = window.Twitch?.ext;
+    if (!ext) {
+      return twitchExtMock;
+    }
+    return ext;
+  }
+}
diff --git a/fog/apps/twitch-extension-panel/src/app/survivor-status.component.ts b/fog/apps/twitch-extension-panel/src/app/survivor-status.component.ts
new file mode 100755
index 0000000..c5eb536
--- /dev/null
+++ b/fog/apps/twitch-extension-panel/src/app/survivor-status.component.ts
@@ -0,0 +1,35 @@
+import { CommonModule } from '@angular/common';
+import { Component, Input } from '@angular/core';
+
+import { MissionSnapshot } from '@fog-explorer/api-interfaces';
+
+@Component({
+  selector: 'fog-survivor-status',
+  standalone: true,
+  imports: [CommonModule],
+  template: `
+    <section class="panel-card">
+      <h3>Survivor Status</h3>
+      <ng-container *ngIf="mission; else idle">
+        <p>Mission: {{ mission.id }}</p>
+        <p>State: {{ mission.state }}</p>
+        <p>Health: {{ mission.stats.health }}</p>
+        <p>Stealth: {{ mission.stats.stealth }}</p>
+        <p>Teamwork: {{ mission.stats.teamwork }}</p>
+        <p>Luck: {{ mission.stats.luck }}</p>
+      </ng-container>
+      <ng-template #idle>
+        <p>No active mission.</p>
+      </ng-template>
+    </section>
+  `,
+  styles: [
+    `
+      .panel-card { padding: 0.75rem; background: #1a1e2a; border-radius: 8px; }
+      p { margin: 0 0 0.25rem; font-size: 0.9rem; }
+    `
+  ]
+})
+export class SurvivorStatusComponent {
+  @Input() mission: MissionSnapshot | null = null;
+}
diff --git a/fog/apps/twitch-extension-panel/src/environments/environment.prod.ts b/fog/apps/twitch-extension-panel/src/environments/environment.prod.ts
new file mode 100755
index 0000000..e0a052f
--- /dev/null
+++ b/fog/apps/twitch-extension-panel/src/environments/environment.prod.ts
@@ -0,0 +1,5 @@
+export const environment = {
+  production: true,
+  mock: false,
+  apiBaseUrl: '/api'
+};
diff --git a/fog/apps/twitch-extension-panel/src/environments/environment.ts b/fog/apps/twitch-extension-panel/src/environments/environment.ts
new file mode 100755
index 0000000..c72410d
--- /dev/null
+++ b/fog/apps/twitch-extension-panel/src/environments/environment.ts
@@ -0,0 +1,5 @@
+export const environment = {
+  production: false,
+  mock: true,
+  apiBaseUrl: 'http://localhost:3333'
+};
diff --git a/fog/apps/twitch-extension-panel/src/index.html b/fog/apps/twitch-extension-panel/src/index.html
new file mode 100755
index 0000000..e56678e
--- /dev/null
+++ b/fog/apps/twitch-extension-panel/src/index.html
@@ -0,0 +1,11 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <title>Fog Expedition Panel</title>
+  </head>
+  <body>
+    <fog-panel-shell></fog-panel-shell>
+  </body>
+  </html>
diff --git a/fog/apps/twitch-extension-panel/src/main.ts b/fog/apps/twitch-extension-panel/src/main.ts
new file mode 100755
index 0000000..a056bcd
--- /dev/null
+++ b/fog/apps/twitch-extension-panel/src/main.ts
@@ -0,0 +1,7 @@
+import { bootstrapApplication } from '@angular/platform-browser';
+
+import { PanelShellComponent } from './app/panel-shell.component';
+
+bootstrapApplication(PanelShellComponent).catch((error) => {
+  console.error(error);
+});
diff --git a/fog/apps/twitch-extension-panel/src/mocks/twitch-ext.mock.ts b/fog/apps/twitch-extension-panel/src/mocks/twitch-ext.mock.ts
new file mode 100755
index 0000000..73c6496
--- /dev/null
+++ b/fog/apps/twitch-extension-panel/src/mocks/twitch-ext.mock.ts
@@ -0,0 +1,25 @@
+export interface TwitchExtLike {
+  onAuthorized(callback: (auth: { token: string; userId: string }) => void): void;
+  onContext(callback: (context: Record<string, unknown>) => void): void;
+  onVisibilityChanged(callback: (isVisible: boolean, context: unknown) => void): void;
+  listen(topic: string, callback: (target: string, contentType: string, message: string) => void): void;
+}
+
+export const twitchExtMock: TwitchExtLike = {
+  onAuthorized(callback) {
+    callback({
+      token:
+        'mock.jwt.token',
+      userId: 'U_mock_viewer'
+    });
+  },
+  onContext(callback) {
+    callback({ theme: 'dark' });
+  },
+  onVisibilityChanged(callback) {
+    callback(true, {});
+  },
+  listen(_topic, _callback) {
+    // No-op in local mock mode.
+  }
+};
diff --git a/fog/apps/twitch-extension-panel/src/styles.css b/fog/apps/twitch-extension-panel/src/styles.css
new file mode 100755
index 0000000..9a90408
--- /dev/null
+++ b/fog/apps/twitch-extension-panel/src/styles.css
@@ -0,0 +1,10 @@
+:root {
+  color-scheme: dark;
+  font-family: Inter, system-ui, sans-serif;
+}
+
+body {
+  margin: 0;
+  background: #0f1117;
+  color: #f3f4f6;
+}
diff --git a/fog/apps/twitch-extension-panel/tsconfig.app.json b/fog/apps/twitch-extension-panel/tsconfig.app.json
new file mode 100755
index 0000000..e879e64
--- /dev/null
+++ b/fog/apps/twitch-extension-panel/tsconfig.app.json
@@ -0,0 +1,8 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "../../dist/out-tsc",
+    "types": []
+  },
+  "include": ["src/**/*.ts"]
+}
diff --git a/fog/docker-compose.yml b/fog/docker-compose.yml
new file mode 100755
index 0000000..0fddaab
--- /dev/null
+++ b/fog/docker-compose.yml
@@ -0,0 +1,47 @@
+services:
+  postgres:
+    image: postgres:16
+    container_name: fog-postgres
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: fog_expedition
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: postgres
+    ports:
+      - '5432:5432'
+    volumes:
+      - fog_postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ['CMD-SHELL', 'pg_isready -U postgres -d fog_expedition']
+      interval: 5s
+      timeout: 5s
+      retries: 10
+
+  redis:
+    image: redis:7
+    container_name: fog-redis
+    restart: unless-stopped
+    ports:
+      - '6379:6379'
+    healthcheck:
+      test: ['CMD', 'redis-cli', 'ping']
+      interval: 5s
+      timeout: 3s
+      retries: 10
+
+  api:
+    build:
+      context: .
+      dockerfile: apps/api/Dockerfile
+    env_file:
+      - .env
+    depends_on:
+      postgres:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+    ports:
+      - '3333:3333'
+
+volumes:
+  fog_postgres_data:
diff --git a/fog/libs/api-interfaces/project.json b/fog/libs/api-interfaces/project.json
new file mode 100755
index 0000000..ac68335
--- /dev/null
+++ b/fog/libs/api-interfaces/project.json
@@ -0,0 +1,18 @@
+{
+  "name": "api-interfaces",
+  "$schema": "../../node_modules/nx/schemas/project-schema.json",
+  "sourceRoot": "libs/api-interfaces/src",
+  "projectType": "library",
+  "targets": {
+    "build": {
+      "executor": "@nx/js:tsc",
+      "outputs": ["{options.outputPath}"],
+      "options": {
+        "outputPath": "dist/libs/api-interfaces",
+        "main": "libs/api-interfaces/src/index.ts",
+        "tsConfig": "libs/api-interfaces/tsconfig.lib.json"
+      }
+    }
+  },
+  "tags": ["scope:shared"]
+}
diff --git a/fog/libs/api-interfaces/src/index.ts b/fog/libs/api-interfaces/src/index.ts
new file mode 100755
index 0000000..405a8e0
--- /dev/null
+++ b/fog/libs/api-interfaces/src/index.ts
@@ -0,0 +1,5 @@
+export * from './lib/survivor';
+export * from './lib/mission';
+export * from './lib/perk';
+export * from './lib/encounter';
+export * from './lib/channel-config';
diff --git a/fog/libs/api-interfaces/src/lib/channel-config.ts b/fog/libs/api-interfaces/src/lib/channel-config.ts
new file mode 100755
index 0000000..ec8685b
--- /dev/null
+++ b/fog/libs/api-interfaces/src/lib/channel-config.ts
@@ -0,0 +1,8 @@
+import { MissionDifficulty } from './mission';
+
+export interface ChannelConfig {
+  channelId: string;
+  difficultyPreset: MissionDifficulty;
+  maxPartySize: number;
+  featureFlags: Record<string, boolean>;
+}
diff --git a/fog/libs/api-interfaces/src/lib/encounter.ts b/fog/libs/api-interfaces/src/lib/encounter.ts
new file mode 100755
index 0000000..b694ee6
--- /dev/null
+++ b/fog/libs/api-interfaces/src/lib/encounter.ts
@@ -0,0 +1,19 @@
+import { MissionDifficulty, MissionState } from './mission';
+import { SurvivorStats } from './survivor';
+
+export interface EncounterResult {
+  outcome: 'success' | 'injury' | 'sacrifice';
+  text: string;
+  successChance: number;
+  roll: number;
+  nextState: MissionState;
+  nextStats: SurvivorStats;
+}
+
+export interface ResolveEncounterInput {
+  stats: SurvivorStats;
+  difficulty: MissionDifficulty;
+  perkIds: string[];
+  tickIndex: number;
+  seed?: number;
+}
diff --git a/fog/libs/api-interfaces/src/lib/mission.ts b/fog/libs/api-interfaces/src/lib/mission.ts
new file mode 100755
index 0000000..7d177ff
--- /dev/null
+++ b/fog/libs/api-interfaces/src/lib/mission.ts
@@ -0,0 +1,35 @@
+import { SurvivorStats } from './survivor';
+
+export enum MissionState {
+  Lobby = 'Lobby',
+  InProgress = 'InProgress',
+  Completed = 'Completed',
+  Failed = 'Failed'
+}
+
+export enum MissionDifficulty {
+  Easy = 'Easy',
+  Normal = 'Normal',
+  Hard = 'Hard',
+  Nightmare = 'Nightmare'
+}
+
+export interface EncounterLogLine {
+  sequence: number;
+  event: string;
+  text: string;
+  successChance: number;
+  roll: number;
+}
+
+export interface MissionSnapshot {
+  id: string;
+  channelId: string;
+  survivorId: string;
+  state: MissionState;
+  difficulty: MissionDifficulty;
+  tickIndex: number;
+  recentLog: EncounterLogLine[];
+  stats: SurvivorStats;
+  perkIds: string[];
+}
diff --git a/fog/libs/api-interfaces/src/lib/perk.ts b/fog/libs/api-interfaces/src/lib/perk.ts
new file mode 100755
index 0000000..7c82f53
--- /dev/null
+++ b/fog/libs/api-interfaces/src/lib/perk.ts
@@ -0,0 +1,19 @@
+export enum ModifierKind {
+  Additive = 'additive',
+  Multiplicative = 'multiplicative',
+  FlatReroll = 'flat_reroll'
+}
+
+export interface PerkModifier {
+  id: string;
+  kind: ModifierKind;
+  value: number;
+  teamPerk?: boolean;
+}
+
+export interface Perk {
+  id: string;
+  name: string;
+  description: string;
+  modifiers: PerkModifier[];
+}
diff --git a/fog/libs/api-interfaces/src/lib/survivor.ts b/fog/libs/api-interfaces/src/lib/survivor.ts
new file mode 100755
index 0000000..aa461c5
--- /dev/null
+++ b/fog/libs/api-interfaces/src/lib/survivor.ts
@@ -0,0 +1,18 @@
+export enum SurvivorState {
+  Active = 'Active',
+  Injured = 'Injured',
+  Sacrificed = 'Sacrificed'
+}
+
+export interface SurvivorStats {
+  health: number;
+  stealth: number;
+  teamwork: number;
+  luck: number;
+}
+
+export interface Survivor {
+  id: string;
+  state: SurvivorState;
+  stats: SurvivorStats;
+}
diff --git a/fog/libs/api-interfaces/tsconfig.lib.json b/fog/libs/api-interfaces/tsconfig.lib.json
new file mode 100755
index 0000000..e6e0baf
--- /dev/null
+++ b/fog/libs/api-interfaces/tsconfig.lib.json
@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "../../dist/out-tsc",
+    "declaration": true,
+    "types": []
+  },
+  "include": ["src/**/*.ts"]
+}
diff --git a/fog/libs/encounter-library/project.json b/fog/libs/encounter-library/project.json
new file mode 100755
index 0000000..5413701
--- /dev/null
+++ b/fog/libs/encounter-library/project.json
@@ -0,0 +1,24 @@
+{
+  "name": "encounter-library",
+  "$schema": "../../node_modules/nx/schemas/project-schema.json",
+  "sourceRoot": "libs/encounter-library/src",
+  "projectType": "library",
+  "targets": {
+    "build": {
+      "executor": "@nx/js:tsc",
+      "outputs": ["{options.outputPath}"],
+      "options": {
+        "outputPath": "dist/libs/encounter-library",
+        "main": "libs/encounter-library/src/index.ts",
+        "tsConfig": "libs/encounter-library/tsconfig.lib.json"
+      }
+    },
+    "validate": {
+      "executor": "@nx/workspace:run-commands",
+      "options": {
+        "command": "ts-node libs/encounter-library/src/lib/validate-encounters.ts"
+      }
+    }
+  },
+  "tags": ["scope:content"]
+}
diff --git a/fog/libs/encounter-library/src/index.ts b/fog/libs/encounter-library/src/index.ts
new file mode 100755
index 0000000..020671a
--- /dev/null
+++ b/fog/libs/encounter-library/src/index.ts
@@ -0,0 +1 @@
+export * from './lib/encounter-library';
diff --git a/fog/libs/encounter-library/src/lib/encounter-library.ts b/fog/libs/encounter-library/src/lib/encounter-library.ts
new file mode 100755
index 0000000..87ae25b
--- /dev/null
+++ b/fog/libs/encounter-library/src/lib/encounter-library.ts
@@ -0,0 +1,42 @@
+import encountersData from './encounters.json';
+
+export interface EncounterRecord {
+  id: string;
+  tier: string;
+  baseSuccessChance: number;
+  difficultyTags: string[];
+  perkTags: string[];
+  flavor: string[];
+}
+
+interface EncounterDocument {
+  schemaVersion: number;
+  records: EncounterRecord[];
+}
+
+const doc = encountersData as EncounterDocument;
+
+export function listEncounters(): EncounterRecord[] {
+  return doc.records;
+}
+
+export function getEncounterById(id: string): EncounterRecord | undefined {
+  return doc.records.find((record) => record.id === id);
+}
+
+export function getRandomEncounterByTier(tier: string, seed = Date.now()): EncounterRecord {
+  const matching = doc.records.filter((record) => record.tier === tier);
+  const pool = matching.length > 0 ? matching : doc.records;
+  const index = Math.abs(seed) % pool.length;
+  return pool[index];
+}
+
+export function migrateEncounterDocument(document: EncounterDocument): EncounterDocument {
+  if (document.schemaVersion === 1) {
+    return document;
+  }
+  return {
+    schemaVersion: 1,
+    records: document.records
+  };
+}
diff --git a/fog/libs/encounter-library/src/lib/encounter.schema.json b/fog/libs/encounter-library/src/lib/encounter.schema.json
new file mode 100755
index 0000000..433f3be
--- /dev/null
+++ b/fog/libs/encounter-library/src/lib/encounter.schema.json
@@ -0,0 +1,45 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "type": "object",
+  "required": ["schemaVersion", "records"],
+  "properties": {
+    "schemaVersion": {
+      "type": "integer",
+      "minimum": 1
+    },
+    "records": {
+      "type": "array",
+      "items": {
+        "type": "object",
+        "required": [
+          "id",
+          "tier",
+          "baseSuccessChance",
+          "difficultyTags",
+          "perkTags",
+          "flavor"
+        ],
+        "properties": {
+          "id": { "type": "string", "minLength": 1 },
+          "tier": { "type": "string" },
+          "baseSuccessChance": { "type": "number", "minimum": 0, "maximum": 1 },
+          "difficultyTags": {
+            "type": "array",
+            "items": { "type": "string" }
+          },
+          "perkTags": {
+            "type": "array",
+            "items": { "type": "string" }
+          },
+          "flavor": {
+            "type": "array",
+            "items": { "type": "string" },
+            "minItems": 1
+          }
+        },
+        "additionalProperties": false
+      }
+    }
+  },
+  "additionalProperties": false
+}
diff --git a/fog/libs/encounter-library/src/lib/encounters.json b/fog/libs/encounter-library/src/lib/encounters.json
new file mode 100755
index 0000000..3de57d9
--- /dev/null
+++ b/fog/libs/encounter-library/src/lib/encounters.json
@@ -0,0 +1,27 @@
+{
+  "schemaVersion": 1,
+  "records": [
+    {
+      "id": "cleanse_hex",
+      "tier": "common",
+      "baseSuccessChance": 0.62,
+      "difficultyTags": ["normal", "hard"],
+      "perkTags": ["totem", "support"],
+      "flavor": [
+        "The bones glow with cursed light.",
+        "You cleanse the totem before the killer returns."
+      ]
+    },
+    {
+      "id": "escape_hatch",
+      "tier": "rare",
+      "baseSuccessChance": 0.41,
+      "difficultyTags": ["hard", "nightmare"],
+      "perkTags": ["mobility", "luck"],
+      "flavor": [
+        "A rusted hatch creaks in the distance.",
+        "One wrong step and the fog closes in."
+      ]
+    }
+  ]
+}
diff --git a/fog/libs/encounter-library/src/lib/validate-encounters.ts b/fog/libs/encounter-library/src/lib/validate-encounters.ts
new file mode 100755
index 0000000..b077c82
--- /dev/null
+++ b/fog/libs/encounter-library/src/lib/validate-encounters.ts
@@ -0,0 +1,27 @@
+import { readFileSync } from 'node:fs';
+import { resolve } from 'node:path';
+import { z } from 'zod';
+
+const encounterRecord = z.object({
+  id: z.string().min(1),
+  tier: z.string(),
+  baseSuccessChance: z.number().min(0).max(1),
+  difficultyTags: z.array(z.string()),
+  perkTags: z.array(z.string()),
+  flavor: z.array(z.string()).min(1)
+});
+
+const encounterDocument = z.object({
+  schemaVersion: z.number().int().min(1),
+  records: z.array(encounterRecord)
+});
+
+function main(): void {
+  const file = resolve(process.cwd(), 'libs/encounter-library/src/lib/encounters.json');
+  const raw = readFileSync(file, 'utf-8');
+  const parsed = JSON.parse(raw) as unknown;
+  encounterDocument.parse(parsed);
+  process.stdout.write('Encounter library validation passed.\n');
+}
+
+main();
diff --git a/fog/libs/encounter-library/tsconfig.lib.json b/fog/libs/encounter-library/tsconfig.lib.json
new file mode 100755
index 0000000..e236ce0
--- /dev/null
+++ b/fog/libs/encounter-library/tsconfig.lib.json
@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "../../dist/out-tsc",
+    "declaration": true,
+    "resolveJsonModule": true
+  },
+  "include": ["src/**/*.ts", "src/**/*.json"]
+}
diff --git a/fog/libs/mission-logic/project.json b/fog/libs/mission-logic/project.json
new file mode 100755
index 0000000..13a4a76
--- /dev/null
+++ b/fog/libs/mission-logic/project.json
@@ -0,0 +1,24 @@
+{
+  "name": "mission-logic",
+  "$schema": "../../node_modules/nx/schemas/project-schema.json",
+  "sourceRoot": "libs/mission-logic/src",
+  "projectType": "library",
+  "targets": {
+    "build": {
+      "executor": "@nx/js:tsc",
+      "outputs": ["{options.outputPath}"],
+      "options": {
+        "outputPath": "dist/libs/mission-logic",
+        "main": "libs/mission-logic/src/index.ts",
+        "tsConfig": "libs/mission-logic/tsconfig.lib.json"
+      }
+    },
+    "simulate": {
+      "executor": "@nx/workspace:run-commands",
+      "options": {
+        "command": "ts-node libs/mission-logic/src/simulator/cli.ts"
+      }
+    }
+  },
+  "tags": ["scope:logic"]
+}
diff --git a/fog/libs/mission-logic/src/index.ts b/fog/libs/mission-logic/src/index.ts
new file mode 100755
index 0000000..7dc6c93
--- /dev/null
+++ b/fog/libs/mission-logic/src/index.ts
@@ -0,0 +1,3 @@
+export * from './lib/encounter-resolver';
+export * from './lib/perk-math';
+export * from './lib/group-synergy.service';
diff --git a/fog/libs/mission-logic/src/lib/encounter-resolver.ts b/fog/libs/mission-logic/src/lib/encounter-resolver.ts
new file mode 100755
index 0000000..9983cdb
--- /dev/null
+++ b/fog/libs/mission-logic/src/lib/encounter-resolver.ts
@@ -0,0 +1,74 @@
+import {
+  EncounterResult,
+  MissionDifficulty,
+  MissionState,
+  ResolveEncounterInput,
+  SurvivorStats
+} from '@fog-explorer/api-interfaces';
+
+import { applyPerkModifiers, clamp } from './perk-math';
+
+const DIFFICULTY_BASE: Record<MissionDifficulty, number> = {
+  [MissionDifficulty.Easy]: 0.72,
+  [MissionDifficulty.Normal]: 0.6,
+  [MissionDifficulty.Hard]: 0.48,
+  [MissionDifficulty.Nightmare]: 0.38
+};
+
+export function resolveEncounter(input: ResolveEncounterInput): EncounterResult {
+  const baseChance = DIFFICULTY_BASE[input.difficulty];
+  const perkBoost = input.perkIds.length * 0.015;
+  const statBoost =
+    input.stats.stealth * 0.002 + input.stats.teamwork * 0.002 + input.stats.luck * 0.002;
+  const successChance = clamp(
+    applyPerkModifiers(baseChance + perkBoost + statBoost, []),
+    0.05,
+    0.95
+  );
+  const roll = seededRoll(input.seed ?? input.tickIndex);
+
+  if (roll <= successChance) {
+    return {
+      outcome: 'success',
+      text: 'The survivor outplayed the fog and advanced.',
+      successChance,
+      roll,
+      nextState: MissionState.InProgress,
+      nextStats: { ...input.stats, health: Math.min(100, input.stats.health + 1) }
+    };
+  }
+
+  const injuryThreshold = successChance + 0.25;
+  if (roll <= injuryThreshold) {
+    const injured = applyDamage(input.stats, 14);
+    return {
+      outcome: 'injury',
+      text: 'A close call leaves the survivor injured.',
+      successChance,
+      roll,
+      nextState: injured.health <= 0 ? MissionState.Failed : MissionState.InProgress,
+      nextStats: injured
+    };
+  }
+
+  return {
+    outcome: 'sacrifice',
+    text: 'The fog claims another soul.',
+    successChance,
+    roll,
+    nextState: MissionState.Failed,
+    nextStats: { ...input.stats, health: 0 }
+  };
+}
+
+function applyDamage(stats: SurvivorStats, amount: number): SurvivorStats {
+  return {
+    ...stats,
+    health: Math.max(0, stats.health - amount)
+  };
+}
+
+function seededRoll(seed: number): number {
+  const normalized = Math.abs(Math.sin(seed * 99991)) * 10000;
+  return normalized - Math.floor(normalized);
+}
diff --git a/fog/libs/mission-logic/src/lib/group-synergy.service.ts b/fog/libs/mission-logic/src/lib/group-synergy.service.ts
new file mode 100755
index 0000000..8cf5632
--- /dev/null
+++ b/fog/libs/mission-logic/src/lib/group-synergy.service.ts
@@ -0,0 +1,15 @@
+import { PerkModifier } from '@fog-explorer/api-interfaces';
+
+export interface GroupContext {
+  memberCount: number;
+  teamModifiers: PerkModifier[];
+}
+
+export class GroupSynergyService {
+  buildContext(teamModifiers: PerkModifier[]): GroupContext {
+    return {
+      memberCount: Math.max(1, Math.min(4, teamModifiers.length || 1)),
+      teamModifiers
+    };
+  }
+}
diff --git a/fog/libs/mission-logic/src/lib/perk-math.ts b/fog/libs/mission-logic/src/lib/perk-math.ts
new file mode 100755
index 0000000..195183d
--- /dev/null
+++ b/fog/libs/mission-logic/src/lib/perk-math.ts
@@ -0,0 +1,18 @@
+import { ModifierKind, PerkModifier } from '@fog-explorer/api-interfaces';
+
+export function applyPerkModifiers(baseChance: number, modifiers: PerkModifier[]): number {
+  let chance = baseChance;
+  for (const modifier of modifiers) {
+    if (modifier.kind === ModifierKind.Additive) {
+      chance += modifier.value;
+    }
+    if (modifier.kind === ModifierKind.Multiplicative) {
+      chance *= modifier.value;
+    }
+  }
+  return clamp(chance, 0.05, 0.95);
+}
+
+export function clamp(value: number, min: number, max: number): number {
+  return Math.max(min, Math.min(max, value));
+}
diff --git a/fog/libs/mission-logic/src/simulator/cli.ts b/fog/libs/mission-logic/src/simulator/cli.ts
new file mode 100755
index 0000000..4f22d68
--- /dev/null
+++ b/fog/libs/mission-logic/src/simulator/cli.ts
@@ -0,0 +1,67 @@
+import { MissionDifficulty, MissionState, SurvivorStats } from '@fog-explorer/api-interfaces';
+
+import { resolveEncounter } from '../lib/encounter-resolver';
+
+function parseArg(name: string, fallback: string): string {
+  const key = `--${name}=`;
+  const arg = process.argv.find((x) => x.startsWith(key));
+  return arg ? arg.slice(key.length) : fallback;
+}
+
+function main(): void {
+  const runs = Number(parseArg('runs', '10000'));
+  const seed = Number(parseArg('seed', '42'));
+  const difficulty = parseArg('difficulty', MissionDifficulty.Normal) as MissionDifficulty;
+
+  let successes = 0;
+  let injuries = 0;
+  let sacrifices = 0;
+  const lengths: number[] = [];
+
+  for (let run = 0; run < runs; run += 1) {
+    let state = MissionState.InProgress;
+    let tick = 0;
+    let stats: SurvivorStats = { health: 100, stealth: 10, teamwork: 10, luck: 10 };
+    while (state === MissionState.InProgress && tick < 40) {
+      tick += 1;
+      const result = resolveEncounter({
+        stats,
+        difficulty,
+        perkIds: [],
+        tickIndex: tick,
+        seed: seed + run * 101 + tick
+      });
+      if (result.outcome === 'success') successes += 1;
+      if (result.outcome === 'injury') injuries += 1;
+      if (result.outcome === 'sacrifice') sacrifices += 1;
+      state = result.nextState;
+      stats = result.nextStats;
+    }
+    lengths.push(tick);
+  }
+
+  lengths.sort((a, b) => a - b);
+  const p50 = lengths[Math.floor(lengths.length * 0.5)];
+  const p90 = lengths[Math.floor(lengths.length * 0.9)];
+  const p99 = lengths[Math.floor(lengths.length * 0.99)];
+
+  const totalEvents = successes + injuries + sacrifices;
+  const pct = (n: number) => ((n / totalEvents) * 100).toFixed(2);
+
+  console.log(
+    JSON.stringify(
+      {
+        runs,
+        difficulty,
+        successRatePct: pct(successes),
+        injuryRatePct: pct(injuries),
+        sacrificeRatePct: pct(sacrifices),
+        missionLengthPercentiles: { p50, p90, p99 }
+      },
+      null,
+      2
+    )
+  );
+}
+
+main();
diff --git a/fog/libs/mission-logic/tsconfig.lib.json b/fog/libs/mission-logic/tsconfig.lib.json
new file mode 100755
index 0000000..48d3bd5
--- /dev/null
+++ b/fog/libs/mission-logic/tsconfig.lib.json
@@ -0,0 +1,10 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "../../dist/out-tsc",
+    "rootDir": "../../",
+    "declaration": true,
+    "types": ["node"]
+  },
+  "include": ["src/**/*.ts"]
+}
diff --git a/fog/nx.json b/fog/nx.json
new file mode 100755
index 0000000..e8233ab
--- /dev/null
+++ b/fog/nx.json
@@ -0,0 +1,31 @@
+{
+  "$schema": "./node_modules/nx/schemas/nx-schema.json",
+  "namedInputs": {
+    "default": ["{projectRoot}/**/*", "sharedGlobals"],
+    "production": [
+      "default",
+      "!{projectRoot}/**/*.spec.ts",
+      "!{projectRoot}/**/*.test.ts"
+    ],
+    "sharedGlobals": []
+  },
+  "plugins": [
+    {
+      "plugin": "@nx/js/typescript",
+      "options": {
+        "typecheck": {
+          "targetName": "typecheck"
+        }
+      }
+    }
+  ],
+  "targetDefaults": {
+    "build": {
+      "dependsOn": ["^build"],
+      "inputs": ["production", "^production"]
+    },
+    "test": {
+      "inputs": ["default", "^production"]
+    }
+  }
+}
diff --git a/fog/package.json b/fog/package.json
new file mode 100755
index 0000000..404eb94
--- /dev/null
+++ b/fog/package.json
@@ -0,0 +1,50 @@
+{
+  "name": "fog-expedition",
+  "version": "0.1.0",
+  "private": true,
+  "scripts": {
+    "nx": "nx",
+    "start": "nx serve twitch-extension-panel",
+    "start:api": "nx serve api",
+    "start:panel": "nx serve twitch-extension-panel",
+    "start:local-dev": "cross-env FOG_PANEL_MOCK=true nx serve twitch-extension-panel",
+    "build": "nx run-many -t build --all",
+    "test": "nx run-many -t test --all",
+    "simulate": "nx run mission-logic:simulate -- --runs=10000 --seed=42"
+  },
+  "dependencies": {
+    "@angular/common": "^18.2.0",
+    "@angular/core": "^18.2.0",
+    "@angular/platform-browser": "^18.2.0",
+    "@angular/platform-browser-dynamic": "^18.2.0",
+    "@nestjs/common": "^10.4.2",
+    "@nestjs/config": "^3.2.3",
+    "@nestjs/core": "^10.4.2",
+    "@nestjs/jwt": "^10.2.0",
+    "@nestjs/platform-express": "^10.4.2",
+    "@nestjs/schedule": "^4.1.1",
+    "@prisma/client": "^5.20.0",
+    "class-transformer": "^0.5.1",
+    "class-validator": "^0.14.1",
+    "ioredis": "^5.4.1",
+    "nestjs-pino": "^4.1.0",
+    "pino": "^9.4.0",
+    "reflect-metadata": "^0.2.2",
+    "rxjs": "^7.8.1",
+    "zod": "^3.23.8"
+  },
+  "devDependencies": {
+    "@nx/angular": "^20.0.0",
+    "@nx/jest": "^20.0.0",
+    "@nx/js": "^20.0.0",
+    "@nx/nest": "^20.0.0",
+    "@nx/node": "^20.0.0",
+    "@nx/workspace": "^20.0.0",
+    "@types/node": "^22.7.5",
+    "cross-env": "^7.0.3",
+    "nx": "^20.0.0",
+    "prisma": "^5.20.0",
+    "ts-node": "^10.9.2",
+    "typescript": "^5.6.2"
+  }
+}
diff --git a/fog/plan.md b/fog/plan.md
new file mode 100755
index 0000000..0f72487
--- /dev/null
+++ b/fog/plan.md
@@ -0,0 +1,234 @@
+---
+name: fog-expedition-nx-and-mission-engine
+overview: Set up an Nx-based monorepo for the Fog Expedition Twitch extension, implement a NestJS API with a tick-based mission engine, and integrate Twitch Extension auth, persistence, and content balance libraries.
+todos:
+  - id: stage1-nx-foundation
+    content: Set up Nx workspace, add Angular/Nest plugins, generate Angular panel app, NestJS API app, and shared @fog-explorer/api-interfaces library, plus Docker Compose for Postgres and Redis.
+    status: completed
+  - id: stage2-extension-frontend
+    content: Build the Twitch panel Angular UI (panel shell, live log, survivor status) and integrate Twitch Extension auth plus an EBS HTTP client using shared interfaces.
+    status: completed
+  - id: stage3-mission-engine
+    content: Implement the 60-second tick engine, stateless encounter resolver, Redis-backed mission/lobby store, and SWF group logic services in the API.
+    status: completed
+  - id: stage4-ebs-persistence
+    content: Add NestJS controllers, Twitch JWT guard, Postgres models/migrations, and Twitch PubSub integration to replace chat commands with extension-driven actions.
+    status: completed
+  - id: stage5-content-balance
+    content: Create the JSON encounter library, formalize perk and modifier types, and add utilities/tests to tune and validate mission outcome probabilities.
+    status: completed
+isProject: false
+---
+
+## Fog Expedition Nx Workspace & ZPG Engine Plan
+
+> **v2 note:** Additions introduced in this revision are marked **[NEW]** throughout.
+
+---
+
+### Stage 1: Workspace & Infrastructure (Nx Foundation)
+
+- **Initialize Nx workspace & tooling**
+  - Ensure the root contains an Nx workspace with TypeScript support (`nx.json`, `project.json`/`workspace.json`, `tsconfig.base.json`, `package.json`).
+  - Add Nx plugins for Angular and NestJS (e.g. `@nx/angular`, `@nx/nest`, `@nx/node`).
+  - Configure `package.json` scripts for running Nx tasks (e.g. `"nx": "nx"`, `"start": "nx serve twitch-extension-panel"`).
+- **Generate core apps**
+  - Create an Angular app for the Twitch Extension Panel at `[apps/twitch-extension-panel/src/main.ts]` via Nx generator (standalone components, no routing complexity initially).
+  - Create a NestJS API app at `[apps/api/src/main.ts]` using Nx's Nest generator, structured with modules for `Auth`, `Missions`, and `TickEngine`.
+- **Shared API interfaces library**
+  - Generate a shared TypeScript library `@fog-explorer/api-interfaces` at `[libs/api-interfaces/src/index.ts]`.
+  - Define core domain types in small focused files:
+    - `[libs/api-interfaces/src/lib/survivor.ts]` containing `Survivor`, `SurvivorStats`, `SurvivorState` (`Active`, `Injured`, `Sacrificed`).
+    - `[libs/api-interfaces/src/lib/mission.ts]` containing `Mission`, `MissionState` (`Lobby`, `InProgress`, `Completed`, `Failed`), `EncounterResult`.
+    - `[libs/api-interfaces/src/lib/perk.ts]` containing `Perk`, `PerkModifier`, and `TeamPerk` flags for SWF mechanics.
+  - Re-export all public contracts from `[libs/api-interfaces/src/index.ts]` for clean imports in both `twitch-extension-panel` and `api`.
+- **Docker & Docker Compose for infra**
+  - Add a root `docker-compose.yml` defining services:
+    - `postgres`: PostgreSQL with exposed port, DB name `fog_expedition`, volume, and healthcheck.
+    - `redis`: Redis for mission timers and lobbies.
+    - Optional `api` service wired to build from `[apps/api/Dockerfile]` and depend on `postgres` and `redis`.
+  - Create Dockerfiles:
+    - `[apps/api/Dockerfile]` building the NestJS API (install deps, build via Nx, run with `node dist/apps/api/main.js`).
+    - `[apps/twitch-extension-panel/Dockerfile]` for building and serving the Angular extension bundle for local testing.
+  - Define environment configuration via `.env`/`.env.local` for DB and Redis connection strings consumed by the API app.
+- **[NEW] Local development without Twitch**
+  - Since `window.Twitch.ext` is unavailable in a local browser, a missing stub causes the panel to hang silently on startup. Solve this early to keep frontend development fluid.
+  - Create a `TwitchExtMock` module at `[apps/twitch-extension-panel/src/mocks/twitch-ext.mock.ts]` that:
+    - Exposes the same interface as `window.Twitch.ext` (`onAuthorized`, `onContext`, `onVisibilityChanged`, `listen`).
+    - Returns a hardcoded fake JWT and viewer ID so all downstream services initialise normally.
+    - Is swapped in via an `environment.ts` flag (`environment.mock = true`) — never shipped in production builds.
+  - Add a `local-dev` npm script that sets the mock flag and serves the panel against a local API.
+
+---
+
+### Stage 2: The Extension Frontend (Angular Panel)
+
+- **Panel shell & layout**
+  - In `twitch-extension-panel`, create a `PanelShellComponent` (e.g. `[apps/twitch-extension-panel/src/app/panel-shell.component.ts]`) that:
+    - Hosts the Live Log area and Survivor Status area.
+    - Handles initial Twitch Extension context/bootstrap (mounts only after `window.Twitch.ext.onAuthorized`, or mock equivalent in dev).
+  - Add presentational components:
+    - `LiveLogComponent` for a scrolling log of encounters/events (Progress Quest style).
+    - `SurvivorStatusComponent` for current survivor(s), health/injury state, mission status, and perks.
+- **Twitch EBS integration & auth**
+  - Implement a `TwitchAuthService` (e.g. `[apps/twitch-extension-panel/src/app/services/twitch-auth.service.ts]`) that:
+    - Wraps `window.Twitch.ext` calls (`onAuthorized`, `onContext`, `onVisibilityChanged`).
+    - Stores the latest JWT and parsed payload (obfuscated Twitch extension user ID).
+  - Implement an `EbsApiService` that:
+    - Attaches the Twitch JWT as `Authorization: Bearer <token>` on all HTTP calls to the NestJS API.
+    - Exposes methods like `startMission`, `getMissionState`, `getPerkInventory` using types from `@fog-explorer/api-interfaces`.
+- **[NEW] EBS resilience & rate limiting**
+  - At scale, thousands of concurrent viewers can simultaneously poll `GET /missions/state`, overwhelming the API.
+  - Cache `GET /missions/state` responses in Redis with a 2–3 second TTL to absorb viewer polling spikes.
+  - The panel should degrade gracefully when the EBS is unreachable — display last-known state rather than a broken UI, and surface a subtle "reconnecting…" indicator.
+  - Add client-side exponential back-off with jitter for all EBS fetch retries.
+- **State & real-time mission display**
+  - Create a `MissionStateStore` using Angular signals (or RxJS `BehaviorSubject` as a fallback) to hold:
+    - Current mission snapshot (`MissionState` + encounter history).
+    - Survivor state(s) and perk inventory.
+  - Wire the store to:
+    - Pull initial state from the API (`getMissionState`).
+    - Subscribe to Twitch PubSub events (via the Twitch JS helper) to apply incremental updates (new log lines, state transitions).
+  - Bind `PanelShellComponent`, `LiveLogComponent`, and `SurvivorStatusComponent` to this store using `computed` signals or `async` pipe for efficient change detection.
+- **[NEW] PubSub message size guard**
+  - Twitch Extension PubSub enforces a 5 KB per-message limit. Unchecked log growth silently drops messages.
+  - Send only the latest N log lines per PubSub message (recommend N = 10–15).
+  - If the panel misses messages (detected via a sequence counter), trigger a full `getMissionState` re-fetch as a fallback.
+
+---
+
+### Stage 3: The ZPG Mission Engine ("Corso")
+
+- **Global heartbeat & tick worker**
+  - In the NestJS API, add a `TickEngineModule` (e.g. `[apps/api/src/app/tick-engine/tick-engine.module.ts]`) and a `TickService` that:
+    - Uses `@nestjs/schedule` (cron) or a background worker to trigger a global tick every 60 seconds.
+    - Acquires a Redis-based distributed lock (e.g. `SETNX tick_lock`) to ensure only one instance runs the tick.
+    - Scans active missions from Redis and dispatches them to the encounter resolver.
+- **[NEW] Tick engine resilience**
+  - Two failure modes need explicit answers before production: long ticks and process restarts.
+  - Set the Redis lock TTL to 50 seconds (10-second buffer before the next tick fires). If a tick is still running when the lock expires, emit a structured warning log — do not silently skip.
+  - Make encounter resolution idempotent: store a tick sequence number per mission in Redis and skip re-processing if the current tick index has already been resolved. This protects against double-application on restart mid-tick.
+  - Log tick start, duration, and number of missions processed as structured fields on every execution.
+- **Encounter resolver (stateless core)**
+  - Implement a pure, stateless function in `[libs/api-interfaces/src/lib/encounter-resolver.ts]` or a new logic lib (e.g. `libs/mission-logic`):
+    - Signature like `resolveEncounter(survivor: SurvivorStats, perks: PerkModifier[], difficulty: Difficulty): EncounterResult`.
+    - Uses RNG with a pluggable seed source for deterministic tests.
+    - Applies modifiers as P{success} = Base + Σ Modifiers clamped to sane bounds.
+  - In the API, create an `EncounterService` that:
+    - Calls the resolver for each mission tick.
+    - Updates mission state (success/fail, injury, sacrifice) and logs events.
+- **Group logic & SWF mechanics**
+  - Introduce a `GroupSynergyService` that:
+    - Accepts a group of 2–4 survivors and their perks.
+    - Aggregates "Team Perk" modifiers, applying them to all relevant rolls.
+    - Computes group-level outcomes (e.g., shared progress, split rewards, synchronized failure states).
+  - Extend the encounter resolver inputs to accept a `groupContext` that influences difficulty modifiers for group missions.
+- **Redis for active missions & lobbies**
+  - Define Redis data structures in the API layer:
+    - `active_mission:{missionId}`: JSON or hash storing mission state, participant IDs, nextTickAt.
+    - `mission_lobby:{lobbyId}`: state for lobby members, mission template, and ready flags.
+  - Implement a `MissionStore` repository that abstracts Redis operations (get/set/expire/lists) from the core mission logic.
+
+---
+
+### Stage 4: Twitch Extension Persistence (EBS)
+
+- **Extension action handlers instead of chat commands**
+  - In the NestJS `MissionsModule`, add controllers like `[apps/api/src/app/missions/missions.controller.ts]` exposing:
+    - `POST /missions/start` to replace `!explore` (triggered by the panel "Start Mission" button).
+    - `GET /missions/state` for current mission snapshot.
+    - `POST /missions/choose-perk` (future) or similar progression actions.
+  - Use DTOs shaped by `@fog-explorer/api-interfaces` types for request/response contracts.
+- **Twitch JWT verification & identity mapping**
+  - Implement a `TwitchAuthModule` and `TwitchAuthGuard` that:
+    - Verifies incoming JWTs from the extension using the Twitch extension secret.
+    - Extracts the obfuscated Twitch user ID and extension channel ID, attaching them to the Nest request context.
+- **[NEW] JWT secret rotation handling**
+  - Twitch can rotate the extension secret, causing all JWT verification to fail globally until the API is redeployed.
+  - On a JWT verification failure, the guard should attempt to re-fetch the current secret from the Twitch API before returning 401.
+  - Cache the fetched secret with a reasonable TTL (e.g. 5 minutes) so rotation recovery is near-instant.
+  - Emit a structured alert log whenever a secret re-fetch occurs — this is a high-signal operational event.
+- **Postgres schema**
+  - Design Postgres tables (via migrations/TypeORM/Prisma) in the API project:
+    - `users` (internal ID, Twitch extension user ID, created_at).
+    - `survivors` (FK to `users`, stats, perk slots, current state: active/injured/sacrificed). Use soft-delete / `sacrificed_at` timestamp rather than hard deletion to support history and leaderboards.
+    - `missions` (FK to `survivors` or group, status, difficulty, timestamps).
+    - `mission_logs` (FK to `missions`, tick index, encounter key, rendered text, RNG details if needed).
+- **[NEW] mission_logs retention strategy**
+  - `mission_logs` can grow unboundedly — a channel with high traffic can generate millions of rows within weeks.
+  - Add an `archived_at` nullable column to `mission_logs` from day one.
+  - Implement a lightweight nightly archival job that marks logs for completed/failed missions older than N days as archived (or bulk-moves them to an archive table).
+  - Add a Postgres index on `(mission_id, archived_at)` to keep active-mission log queries fast regardless of historical volume.
+- **Twitch PubSub integration for ticks**
+  - Create a `TwitchPubSubService` in the API that:
+    - Signs messages to Twitch's Extension PubSub endpoint using the extension client ID and secret.
+    - Publishes log updates and mission state deltas on each tick for relevant channels.
+  - On the frontend, extend `TwitchAuthService` or a dedicated `PubSubService` to:
+    - Subscribe to mission update topics.
+    - Forward received events into the `MissionStateStore`, appending log lines and updating survivor/mission state.
+- **[NEW] Broadcaster configuration panel**
+  - Broadcasters frequently need to configure extension behaviour (difficulty presets, max survivors, opt-in features). This is often needed earlier than expected.
+  - Create a separate Angular app (or a route within the panel) for the Twitch Broadcaster Config view.
+  - Add a `POST /channel/config` EBS endpoint that accepts channel-level settings and stores them against the channel ID in Postgres.
+  - The config schema should at minimum cover: mission difficulty preset, max party size, and feature flags for beta mechanics.
+  - Apply these settings in `MissionsModule` when resolving encounters for that channel.
+
+---
+
+### Stage 5: Content Library & Balance
+
+- **JSON encounter library**
+  - Create a dedicated library `@fog-explorer/encounter-library` at `[libs/encounter-library/src/lib/encounters.json]` to hold all flavor text and base parameters.
+  - Structure encounters as JSON records:
+    - Keys like `"cleanse_hex"`, `"escape_hatch"`, etc.
+    - Fields for base success chance, difficulty tags, flavor text variants, and perk tags.
+  - Add a small TypeScript wrapper in `[libs/encounter-library/src/lib/encounter-library.ts]` to:
+    - Load encounters.
+    - Expose helper functions (e.g. `getEncounterById`, `getRandomEncounterByTier`).
+- **[NEW] Encounter JSON schema versioning**
+  - Adding new fields to `encounters.json` silently breaks records that predate those fields, causing runtime surprises.
+  - Define a JSON Schema (or Zod schema) for the encounter record format and commit it alongside `encounters.json`.
+  - Add a build-time validation step (Nx target) that validates all encounter records against the schema on every build.
+  - Increment a `schemaVersion` field whenever breaking fields are added, and provide a migration helper for existing records.
+- **Perk system & balance utilities**
+  - In `@fog-explorer/api-interfaces` (or a dedicated `@fog-explorer/perks` lib), formalize perk modifier types:
+    - Additive and multiplicative modifiers, flat reroll mechanics, group-boosting perks.
+  - Implement a `PerkMath` helper that:
+    - Aggregates modifiers into a final P{success} value.
+    - Separates survivor-level modifiers from team-level modifiers to keep SWF behaviour clear.
+  - Provide a small test harness (unit tests in the mission logic lib) to:
+    - Validate that typical perk loadouts produce reasonable success/fail/injury rates.
+    - Guard against accidental balance regressions.
+- **[NEW] Simulation CLI for balance tuning**
+  - Unit tests confirm correctness but are too coarse for tuning probability distributions. A headless simulator is far more useful.
+  - Add an Nx target: `nx run mission-logic:simulate -- --runs=10000 --perkSet=flashlight,spine_chill`
+  - The simulator should output: mean success rate, injury rate, sacrifice rate, and a percentile breakdown of mission lengths.
+  - Wire it into CI with a fixed seed so regressions in outcome distributions surface as test failures without flakiness.
+
+---
+
+### [NEW] Cross-Cutting Concerns
+
+These topics were absent from the original plan but span all stages and should be established early.
+
+- **Observability**
+  - Install Pino as the NestJS logger (structured JSON output). Replace all `console.log` usage with pino log calls.
+  - Define a standard log schema with fields: `traceId`, `channelId`, `missionId`, `tickIndex`, `durationMs`, `event`.
+  - Instrument the tick engine specifically: log tick start, active mission count, tick duration, and any per-mission errors as structured fields on every execution.
+  - Add basic application metrics (tick processing time, encounter outcomes, error rates) — even a simple in-memory counter exported to a `/metrics` endpoint is sufficient to start.
+
+---
+
+### High-Level Architecture Diagram
+
+```mermaid
+flowchart LR
+  viewerPanel["Twitch Panel (Angular)"] -->|"JWT via window.Twitch.ext"| apiGateway["NestJS API (EBS)"]
+  apiGateway -->|"REST: /missions/*"| missionEngine["Mission Engine / Tick Service"]
+  missionEngine -->|"state + logs"| postgresDb["Postgres"]
+  missionEngine -->|"timers + lobbies"| redisStore["Redis"]
+  missionEngine -->|"Tick updates"| twitchPubSub["Twitch Extension PubSub"]
+  twitchPubSub -->|"Push events"| viewerPanel
+  apiGateway -->|"channel config"| postgresDb
+  broadcasterConfig["Broadcaster Config Panel"] -->|"POST /channel/config"| apiGateway
+```
\ No newline at end of file
diff --git a/fog/tsconfig.base.json b/fog/tsconfig.base.json
new file mode 100755
index 0000000..56da096
--- /dev/null
+++ b/fog/tsconfig.base.json
@@ -0,0 +1,25 @@
+{
+  "compileOnSave": false,
+  "compilerOptions": {
+    "rootDir": ".",
+    "sourceMap": true,
+    "declaration": false,
+    "moduleResolution": "node",
+    "emitDecoratorMetadata": true,
+    "experimentalDecorators": true,
+    "importHelpers": false,
+    "target": "ES2022",
+    "module": "ESNext",
+    "lib": ["ES2022", "DOM"],
+    "skipLibCheck": true,
+    "baseUrl": ".",
+    "paths": {
+      "@fog-explorer/api-interfaces": ["libs/api-interfaces/src/index.ts"],
+      "@fog-explorer/encounter-library": [
+        "libs/encounter-library/src/index.ts"
+      ],
+      "@fog-explorer/mission-logic": ["libs/mission-logic/src/index.ts"]
+    }
+  },
+  "exclude": ["node_modules", "tmp"]
+}
diff --git a/fog/tsconfig.json b/fog/tsconfig.json
new file mode 100755
index 0000000..bfacec1
--- /dev/null
+++ b/fog/tsconfig.json
@@ -0,0 +1,5 @@
+{
+  "extends": "./tsconfig.base.json",
+  "files": [],
+  "references": []
+}
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..70c7272
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,6 @@
+{
+  "name": "fog",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {}
+}