A community based topic aggregation platform built on atproto

docs: author-owned-posts PRD rev 2.1 + build-loop plan/tracker master

Design: posts flip to author-repo records (social.coves.community.postv2) with community-signed acceptance/removal records; per-(community,post) admissions state. Externally reviewed (Codex gpt-5.6-sol, 2026-08-05). Loop: 8 PR-sized tasks, /tdd -> /second-opinion -> /fix-pr -> make ci -> --no-ff merge per task. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>