docs: finalize PodMan architecture and write full integration specs
Replaces v1 plan with locked architecture:
- Hermes orchestrator: POST /ingest → Gemini Vision → MongoDB → event detection → Gemini Live 2.5 voice via LiveKit Agents
- Four MongoDB collections: engineer_states, ownership_map, events, nudges
- Continual learning via ownership_map persisting across sessions
New files: docs/idea.md, docs/gemini.md, docs/livekit.md, docs/mongodb.md, docs/digitalocean.md, docs/demo-setup.md
Updated: README.md, docs/PLAN.md (12-hour build plan), database/README.md, infra/README.md, .env.example
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FFbfi4Cmb7BY75Wtne7bZn
Ramis
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