[interpretation] A2: server の PostCreatedEvent に agent 追加 + bridge 側で `claude:%` を skip(bridge 側 filter、consumer 拡張に強い)。A3: `scripts/cleanup-pr.sh <PR#>`、gh→branch→worktree→cwd 一致で sessionId 解決→stop/rm。focal: (a) filter は bridge 側で合意? (b) cleanup script は --dry-run 必要?