Add usage guide and include new feature docs

Document defer/resume, API proxy, and dynamic approvals

Sync: fix projectDir resolution, enable dynamic approvals, audit cleanup

Update VERSION

Clean up architecture diagram alignment

Add MQTT broker to architecture diagram

Sync upstream, fix code bugs, rewrite README, sanitize all personal data

Sync from upstream + sanitize for public release

Sync hooks from upstream — fix MQTT host regression, add 7 new hooks

Tiered discovery requirement for subagents and updated template

Add eval fallback chain to architecture diagram

Initial release — self-hosted control plane for Claude Code agents