[done] PR #114 で agent_accounts foundation + mention E2E landing。残 scope (別 PR): - `agent` envelope field 廃止 + event log migration - AuthorB…

[done] Phase 2 PR #117。(A) per-token owner_handle + create_post auto-provision (B) mention chip click + mention_target view + 客側 post_mentio…

[done] Phase 3 PR #123。author_handle 統合 / migration 007 / OAuth DID→handle resolver / AuthorBadge 統合(AI+dispatch chip 廃止) / docs。 agent fiel…

[done] Phase 4 PR #126(cleanup-only、-226/+145)。legacy `agent` field を server / SPA / projection 全廃。 agent-mention initiative これで Phase 1+2+3…