Canon: The Night The Cathedral Awakened + Federation Manifesto v1.0.0

fix(deps): add httpx and python-dotenv for D1 client

Phase 2: Cloudflare D1 Vault Persistence

Feat: Add /inbox + /envelope/{id}/read endpoints so Council can read mail

Phase 1A: Modular Node Conformance

Deploy Federation Node: A2A identity and health server