feat(gpu-box): news-ingester migrated, Mini compose drops the service block

Phase 2f-2. RSS/Atom ingester (15-min tick → mana_platform.news.curated_articles)
moved to GPU-Box. Service has zero hot-path coupling, all the writes go
cross-LAN to Mini-postgres analog to the Glitchtip pattern.

Two implementation gotchas worth recording:

1. cross-arch image transfer doesn't work. Saved news-ingester:local
   from the Mini (Apple M4 → linux/arm64), tried `docker load` on the
   GPU-Box (linux/amd64) and got 'exec format error' on every restart.
   Native build on the GPU-Box was the only path forward.

2. The original services/news-ingester/Dockerfile assumes
   pnpm-workspace state from prior builds (no COPY for packages/shared-rss
   in the build context). Fresh builds error with
   ERR_PNPM_WORKSPACE_PKG_NOT_FOUND.

Workaround: a GPU-Box-specific Dockerfile at infrastructure/news-ingester/
that vendors shared-rss into the build via a workspace:* → file:ref
sed swap. Build context is the repo root (sparse-clone provides
packages/shared-rss + services/news-ingester). The Mini-side Dockerfile
stays untouched so existing CD builds aren't disturbed.

Mini-side: container stopped + removed from docker-compose.macmini.yml,
running container count 44 → 39.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docker-compose.macmini.yml

@@ -1436,39 +1436,6 @@ services:
   # from the same table to serve /api/v1/news/feed; user reading lists
   # remain client-side in the unified Mana app's local IndexedDB.
 
-  news-ingester:
-    build:
-      context: services/news-ingester
-      dockerfile: Dockerfile
-    image: news-ingester:local
-    container_name: news-ingester
-    restart: always
-    mem_limit: 256m
-    depends_on:
-      postgres: { condition: service_healthy }
-    environment:
-      TZ: Europe/Berlin
-      PORT: 3066
-      DATABASE_URL: postgresql://postgres:${POSTGRES_PASSWORD:-mana123}@postgres:5432/mana_platform
-      TICK_INTERVAL_MS: "900000"
-      RUN_ON_STARTUP: "true"
-    ports:
-      - "3066:3066"
-    healthcheck:
-      test: ["CMD", "bun", "-e", "fetch('http://127.0.0.1:3066/health').then(r=>process.exit(r.ok?0:1)).catch(()=>process.exit(1))"]
-      interval: 120s
-      timeout: 10s
-      retries: 3
-      start_period: 30s
-
-  # ============================================
-  # Games
-  # ============================================
-  # whopixels was removed 2026-04-09 — its core mechanic (LLM-driven
-  # historical figure guessing) lives now as the `who` module inside
-  # apps/mana/apps/web. The standalone Phaser/Node container is gone;
-  # see docs/WHO_MODULE.md for the migration rationale.
-
 volumes:
   redis_data:
     name: mana-redis-data