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* fix(runtime): resolve omitted run owners before idempotent reuse HTTP run admissions do not pass a user_id. The SQL run store stamps the request user from the contextvar onto the row, but RunManager kept None on its process-local RunRecord, so the two disagreed about who owns the run. A keyed retry that reached a peer worker, or the owning worker after cleanup() released its local record, hydrated the stamped row, compared its owner with None, and raised "Run idempotency key resolved to a different thread or user", which start_run surfaced as a 500. MemoryRunStore stored None on both sides and never hit the check. The same mismatch hid HTTP runs from owner-scoped history reads, which filter local records by the current user, and skipped the worker's MCP background_tasks projection, which only runs for records with an owner. create() and _admit_thread_operation() now resolve an omitted owner from the current user before building the record, and keep None when no user is in context instead of falling back to the default bucket, so the local record and every store agree on the owner. HTTP runs now receive the background_tasks projection, so the replay golden's values frames gain that key. * docs(changelog): reference #5401 in the keyed retry owner fix entry * test(runtime): close the SQL engine when peer-reuse test setup fails Review follow-up on #5401: the sql case of the two-worker start_run test initialized the engine above the try whose finally calls close_engine(). init_engine() assigns the module-global engine and session factory before bootstrapping the schema, so a failure there skipped the teardown and left a stale engine for later tests in the same process. Store setup and the RunManager workers now live inside the try, so the teardown runs whether setup or the test body fails.