commit()/progress()/note() now refresh last_heartbeat_at on the success
path (best-effort, suppressed), not only on rejection — an actively
writing agent no longer looks idle to the reaper between verb successes.
commit()/progress() verify the caller holds the active claim
(active_claimant_id), not merely the historical assigned_to, so a reaped
or handed-off assignee can no longer write onto a freed task; a non-holder
gets a not_authorized envelope with a clear remediate.
progress() with no plan_step on a task that has steps is accepted (product
decision for narrative mid-step updates) and logs a soft warning instead of
rejecting.
Renn F
2c96bd09f6