Add documentation to `replit.md` to specify `artifact.toml` as the canonical deployment configuration and enhance comments in `routes/index.ts` to explain operational tradeoffs for stub mode. Replit-Commit-Author: Agent Replit-Commit-Session-Id: 90c7a60b-2c61-4699-b5c6-6a1ac7469a4d Replit-Commit-Checkpoint-Type: full_checkpoint Replit-Commit-Event-Id: f46cc2d3-95ce-4f2b-8ab1-d8cd41d10743 Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/9f85e954-647c-46a5-90a7-396e495a805a/90c7a60b-2c61-4699-b5c6-6a1ac7469a4d/G03TLre Replit-Helium-Checkpoint-Created: true