The CLI-adapter era `connector.command` field became vestigial once every
provider dispatch went through pi-ai. The schema still required a non-empty
command, so onboarding saveConnector silently rejected every Pi Mono row
(which carries an empty default). Remove the field from the payload chain
(renderer → IPC schema → DB CRUD → run dispatch → worker job), narrow
RunJob.taskId to match EnqueueRunPayload, and drop the dead helper plus
its test. Schema column stays NOT NULL for DB compatibility; seedConnectors
writes a literal empty string so no migration is needed.
- DB introspection tests: introduce local RawDb alias for casts
that poke into the private .db handle.
- IPC handler tests: introduce IpcHandler alias matching the
registerHandle signature (event + unknown args).
- selective-ipc / session-management: narrow handler and data
params to unknown or the minimum shape the code reads.
- CAS rejects second claimer when two agents attempt same task
- Losing agent can checkout a different task
- In-progress status guard blocks new checkouts
- Lock release clears fields but CAS still checks status
- Stale lock recovery frees locks and resets status to todo
- Recovered task can be re-checked-out by another agent
- STALE_LOCK_TIMEOUT_MS validated at 15 minutes
ZacharyZhang-NY