chore(realtime): address PR review feedback

- Remove redundant SOCKET_PORT=3002 env from Dockerfile runner stage
  (env.PORT already defaults to 3002 via zod schema).
- Reorder PORT fallback so an explicitly-set SOCKET_PORT wins over
  the schema default for PORT; keeps SOCKET_PORT functional as an
  override instead of dead code.
- Add dedicated type-check CI step for @sim/realtime so TS errors
  surface pre-deploy (the Dockerfile runs source TS via Bun and has
  no implicit build-time type check).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.github/workflows/test-build.yml

@@ -109,6 +109,9 @@ jobs:
       - name: Verify realtime prune graph
         run: bun run check:realtime-prune
 
+      - name: Type-check realtime server
+        run: bunx turbo run type-check --filter=@sim/realtime
+
       - name: Run tests with coverage
         env:
           NODE_OPTIONS: '--no-warnings --max-old-space-size=8192'

apps/realtime/src/index.ts

@@ -29,7 +29,7 @@ async function createRoomManager(io: SocketIOServer): Promise<IRoomManager> {
 
 async function main() {
   const httpServer = createServer()
-  const PORT = Number(env.PORT || env.SOCKET_PORT || 3002)
+  const PORT = Number(env.SOCKET_PORT ?? env.PORT ?? 3002)
 
   logger.info('Starting Socket.IO server...', {
     port: PORT,

docker/realtime.Dockerfile

@@ -37,7 +37,6 @@ WORKDIR /app
 
 ENV NODE_ENV=production \
     PORT=3002 \
-    SOCKET_PORT=3002 \
     HOSTNAME="0.0.0.0"
 
 RUN addgroup -g 1001 -S nodejs && \