When a run worker loses its lease while the runtime yields no events
(long tool or model work), lease loss was only detected on the next
heartbeat renewal (up to 60s). A reclaimed worker could execute in
parallel during that window.
Add a dedicated lease poll that aborts stale workers within a few
seconds and call runtime.abort so pi-runtime stops promptly.
Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: cynarAI <cynarAI@users.noreply.github.com>
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