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0f5102427e
## Summary Fixes two related bugs that cause jobs in large workflows (50+ parallel jobs) to never get a runner assigned even though runners are free. ### Bug 1 — Concurrent runner race When N runners all poll `FetchTask` with a stale `tasksVersion` simultaneously, they all query the same waiting job list sorted by `(updated, id)` and all pick **job #1**. Only one wins the `UPDATE WHERE task_id=0` optimistic lock; the rest return empty-handed but still receive `latestVersion` in the response. They then consider themselves "up to date" and skip `PickTask` on every subsequent poll, leaving jobs #2–50 permanently unassigned. **Fix:** `CreateTaskForRunner` now iterates through all matching waiting jobs. When the optimistic lock fails on job #1, it immediately tries job #2, then #3, etc., each in its own independent transaction so a failed attempt rolls back cleanly before the next candidate is tried. `PickTask` no longer wraps this call in an outer `db.WithTx` (which caused `halfCommitter` entanglement that prevented per-attempt rollbacks). ### Bug 2 — Idle runner doesn't re-check after finishing a task `tasks_version` only bumps when a job transitions **to** waiting (new workflow triggered, blocked→unblocked). After a runner finishes its current task it polls `FetchTask` with `tasksVersion == latestVersion`, so the server skips `PickTask` entirely — the remaining 45 waiting jobs are invisible to the now-idle runner. **Fix:** Also call `IncreaseTaskVersion` in `UpdateRunJob` when a (non-reusable-caller) job transitions to a **done** state. Idle runners then see a version mismatch on their next poll and attempt `PickTask`, picking up the remaining jobs.