feat: Sprint 0 — CI/CD pipeline, production Docker, health checks

CI Pipeline (.github/workflows/ci.yml):
- 5 jobs: typecheck, lint, test, build, e2e (parallel where possible)
- PostgreSQL 16 + Redis 7 service containers for test/e2e
- pnpm store, Turborepo, Playwright browser caching
- Concurrency groups cancel in-progress runs

Production Docker:
- Dockerfile.prod: 3-stage build (deps → build → runtime ~150MB)
- docker-compose.prod.yml: postgres + redis + app with health checks
- .dockerignore for fast builds
- next.config.ts: output: "standalone" for minimal runtime

Health Check Endpoints:
- GET /api/health — liveness probe (200 OK, no deps)
- GET /api/ready — readiness probe (postgres + redis connectivity)

Documentation:
- docs/ci-cd-manual.md — full pipeline manual with troubleshooting
- plan.md — Product Owner strategic plan (bottlenecks, growth, automation)

Co-Authored-By: claude-flow <ruv@ruv.net>

.dockerignore

@@ -0,0 +1,42 @@
+# Dependencies (reinstalled in container)
+node_modules
+**/node_modules
+
+# Build outputs
+.next
+**/dist
+**/.turbo
+
+# Git
+.git
+.gitignore
+
+# Dev tooling
+.vscode
+.idea
+*.swp
+*.swo
+
+# Environment files (injected at runtime)
+.env
+.env.*
+!.env.example
+
+# Test artifacts
+coverage
+**/coverage
+e2e-results
+playwright-report
+
+# Docker files (avoid recursive context)
+Dockerfile*
+docker-compose*
+
+# Documentation
+docs
+*.md
+!packages/*/README.md
+
+# OS files
+.DS_Store
+Thumbs.db