Append one event to the workspace event log.

Fetch events after cursor (at-least-once delivery).

Workspace bus health and topic list.

List events pending human approval (hidden from standard poll).

Approve a pending event so agents can see it on poll.

Reject a pending event and notify the originating agent.

Acquire an exclusive advisory lease on a workspace resource.

Release a held lease (idempotent if already expired).

Extend TTL on an active lease (heartbeat).

Check lock state without acquiring (no auth required).