[THardy98]

Summary

Add experimental workflow-session activities and worker session configuration, pinned to Core 0de941f3 (temporalio/sdk-rust#1687, stacked on #1691 and extraction #1686).

• Activities opt in with workflow.ActivitySessionOptions.workflow_session(); omitted options retain ordinary routing. The factory returns an immutable variant rather than exposing an empty/false options state.
• worker.WorkerSessionOptions() enables sticky activity polling. Optional worker.SingleSessionOptions(stable_identity=...) selects lifetime dedication to a stable destination; the Python API and bridge reflect the session proto model.
• Session workers currently require fixed-size activity slots: at least two for paired polling, or one for sticky-only single-session polling. Ordinary resource-tuned workers are unchanged.
• Update the Core pin, generated bindings, lockfile, and imported Core release notes.

Focused tests

• Four serverless command cases: ordinary routing, workflow-session routing, and an interceptor adding/removing membership. No matrix over activity caller forms, queue choices, or eager settings.
• One factory-construction check.
• Two slot-supplier validation tests and one nested-options native bridge smoke test in the existing test_worker.py. The standalone affinity-forwarding test file is removed.
• Two opt-in real-server tests use new_worker, the default sandboxed runner, and real worker identities. They cover queued activity/retry colocation, ordinary routing to a separate queue, workflow resumption, persisted membership, offline replay, and backlog draining under activity-capacity pressure.

Server integration scope

Target temporalio/temporal#12630 with system.enableStickyActivityExecution enabled for the test namespace. See tests/worker/STICKY_ACTIVITY_INTEGRATION.md for the command and limitations.

These integration tests disable eager execution and do not configure single-session isolation: the current server PR rejects that policy. They establish observed colocation, not direct observation of every physical queue delivery. Worker-loss recovery, relocation, timeout fallback, lifetime isolation, and AgentCore/WCI lifecycle remain outside this validation.

Validation

• poe lint: passed, including all three type checkers.
• Focused activity, worker-session, existing ordinary resource-tuner, and visitor checks against the standard ephemeral server: 20 passed, 2 custom-server tests skipped.
• Both real-server tests passed against the custom server before this test-only reduction. The latest rerun was blocked by the local server reporting SQL logic error: no such table: namespaces; the existing ordinary resource-tuner control also timed out against that server. No server data/configuration was changed to work around it.
• git diff --check: passed.
• The native bridge was previously rebuilt and linted for this Core pin; this follow-up changes tests only. The full Python test suite has not been run locally.

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