When the engine hard-cancels in-flight work during a pause/resume cycle and the
workflow graph run ends with the task re-queued to `todo`, the executor used to
leave it for a fresh scheduler dispatch and fire a spurious failure
notification. It now continues the agent session in place via a bounded internal
retry (reusing the graph-resume retry budget + backoff), falling back to the
benign todo re-queue only after retries are exhausted.
- Scoped strictly to engine-internal aborts via a typed `isEngineInternalAbort`
discriminant; genuine user/global/task pauses are never auto-resumed.
- Re-checks the task at retry fire time and aborts the auto-continue if it was
paused, moved, or deleted during the backoff window.
- Clears any stale `failed` status and emits an `Auto-recovered:` log so the
deferred failure notification is suppressed.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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