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* fix(runtime): stop idempotent reuse from blocking the thread on a peer worker When an idempotent run admission lands on a worker that does not own the run, RunManager hydrates the stored row and returns it as the reused record. It also registered that row in the worker's local run map, but only the owning worker's task lifecycle finalizes and cleans up local records, so the copy kept its admission-time pending/running status for the life of the process. On that worker every later reject-strategy admission for the thread returned 409 until a restart, run reads kept reporting the stale status, orphan reconciliation skipped the run as locally live if the owner crashed, and a cancel took the local-owner path and marked the owner's still-running row interrupted. Return the hydrated row as a detached store-only handle instead of registering it. A local record for the key is already returned before the store insert, so the removed lookup of an existing local record was unreachable. get(), cancel() and reconciliation now read the durable row on the peer, matching the documented non-owner contract. * test(runtime): pin keyed retries of a terminal reused run on the SQL store Review follow-up on #5393: the post-cleanup release relied on a keyed retry resolving through the terminal row's idempotency conflict, but only MemoryRunStore pinned that path, and no test retried on the owner after its local record was cleaned up. The SQL repository test now retries the key on the peer and on the owner once the run is terminal and cleaned up, asserting both get the same run back as a store-only reused handle before the keyless follow-up is admitted.