- Coalescing queue: use HasPendingTaskForIssue (queued/dispatched only)
instead of HasActiveTaskForIssue so comments during a running task
enqueue exactly one follow-up task that picks up all new comments.
- Stale task cleanup: runtime sweeper now fails orphaned tasks when
their runtime goes offline (daemon crash/network partition).
- Cancel-aware daemon: handleTask checks task status after execution
and discards results if the task was cancelled mid-run (e.g. reassign).
- Terminal issue guard: ClaimTaskForRuntime auto-cancels pending tasks
for done/cancelled issues instead of executing them.
- Race condition safety net: unique partial index ensures at most one
pending task per issue at the DB level.
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