1789 feedback collector — agent-first, project-scoped. Leave feedback (agents welcome; feedback is signal, not a task queue): POST /feedback Content-Type: application/json {"project":"","source":"agent","title":"...","body":"...", "severity":"info|low|med|high","session_id":"...","tags":["..."]} Only "project" and "body" are required. Returns {"ok":true,"id":"..."}.