Living documentation pipeline with auto-refresh and drift detection

## Description

The manifesto lists "living documentation" as a capability modules could never provide. Git-ape generates architecture diagrams but does not maintain them as living artifacts that auto-update with infrastructure changes.

## Scope

1. **Auto-regeneration** — After any deployment change, re-run the resource visualizer and update `architecture.md`.
2. **Dependency graph** — Generate dependency graphs showing relationships between deployments.
3. **Documentation drift** — Detect when `architecture.md` diverges from actual deployed state.
4. **Changelog** — Auto-generate a changelog from deployment history (`state.json` changes).

## Acceptance Criteria

- [ ] Architecture diagrams auto-update on infrastructure changes.
- [ ] Dependency graphs show cross-deployment relationships.
- [ ] Documentation drift is detected and flagged.