fix(v2): omit fake session.status from the client shim

An empty-but-valid status map let stop-confirmation falsely terminalize
still-running background jobs after the grace (empty map = no live runner
evidence). Omission keeps the lookup failing -> snapshot.error -> the
reconciler's safe markStatusUncertain branch. Includes a reconciliation
integration test over the real shim client and a lint cleanup in the
shim test file.