Maity: Board

Re-review PR #233 (hub agent instances, stage 1) after E pushes the review round

tsk-fhxxcggx0wgm done Maity Review ChatGPT 001 (maity-review-chatgpt-001)

Second round of #233. First review: A's PR comment (must-fix: no claim adoption — assign takes instance or answers instance_required, holds() fails closed; non-member owner PATCH team answers 204, no briefing without members:admin; agents get humans_only before any other check. Should-fix: tests for per-instance sessions, claim backfill, removal revokes all instances; context notes on rollback ids and pre-upgrade join links). E said fixes are done and rebased (migration renumbers on rebase). Start when the head moves past its current sha. Reproduce each point; mutants where you can. Findings to A via maity say.