Surfaced by a full-tree audit; each ships a regression test where the
behavior is deterministically testable.
- swarm: deliver a handoff's mailbox note BEFORE registering the new task,
so a mailbox failure can't leave a phantom pending task in the coordinator.
- specialist: put a foreground sub-agent child in its own process group and
group-kill on cancel/timeout (+ WaitDelay backstop), so a build/server it
forked dies with it instead of orphaning.
- oauth: serialize on-demand token refresh per key (keyed mutex) and re-load
inside the lock, so parallel callers don't each spend the single-use
refresh token (all but one would otherwise fail at the token endpoint).
- mcp: treat a "source already gone" rename during legacy-token migration as
success, so a concurrent migrator doesn't wrongly drop an OAuth MCP server.
- cron: claim a due job atomically (advance NextRunAt under the per-job lock)
before running it, so two schedulers can't double-fire the same job.
KRATOS
9e800b4ffc