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63784baed5
Addresses comfyanonymous's review nit on PR #13905. The store is touched from three threads — the aiohttp event loop (``register`` via ``post_prompt``), the worker thread (``unregister`` via the ``prompt_worker`` try/finally and ``execution_error`` paths), and any thread that fires ``send_sync`` (``inject``). Individual ``dict`` operations are GIL-atomic but ``register``'s ``len -> pop -> setitem`` and ``inject``'s ``get -> {**a, **b}`` are multi-step compounds whose interleaving without a lock is racy. A single ``threading.Lock`` keeps the FIFO cap honest and snapshots the envelope under the lock before the spread runs. Adds a stress-test that runs concurrent register/unregister/inject for 100 ms across five threads and asserts no exception escapes and the capacity bound is held.