Read-only ActivityPub → atproto bridge for the threadiverse using Coves lexicons

chore: prep for public mirror — untrack build-loop internals, point links at GitHub master

- Untrack LOOP_STATE.md and tasks/ (internal AI build-loop state and specs; files remain local, now gitignored) - Trim PLAN.md to the architecture and locked decisions; drop the loop iteration tables and protocol - Point Coves links (README, CI lexicon-drift clone) at github.com/BrettM86/coves Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>