[moetemp]

What changed?

This PR pins Core to the in-process stream service and reaches it from Python through a generated stub.

• temporalio/bridge/sdk-core points at the Brook v2 Core top 70f5d3e3 (c5c). It has the streams crate with its Redis and memory stores and the StreamService, including RetireProducer, the 16 KiB read state and the owner check per owner, and no output commit or staging. The generated protos and Core's changelog fragments follow the pin.
• temporalio/bridge/src/streams.rs is about 60 lines of pyo3. Each connect_stream_store call builds a store from a serialized StreamStoreConfig on the client's connection.
• scripts/gen_bridge_client.py generates a typed StreamService into streams_generated.py, so no stream call is hand-written. A failed call raises StreamCallFailure with the parsed StreamFailure.
• The bridge Worker takes no store here. Handing a store to Core's Worker is Ford's, with the Workflow Task publish.

Why?

The store runtime lives in Core now, so every Core-based SDK binds one copy of it (DD-86). Lang reaches it through one generated stub and one call (DD-88).

How did you test it?

Link to a test plan if any -

• Unit Tests
• Staging
• End to End Tests

tests/bridge/test_stream_store.py runs on the dev server with Core's memory store.

[moetemp]

Combined into #239.