Add intermediate model payload conversion hooks#1655
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This was referenced Jul 16, 2026
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Adds SDK payload-converter support for generated models that expose _temporal_to_intermediate/_temporal_from_intermediate hooks, and wires system Nexus conversion so nested user payloads use the workflow payload converter context.\n\nValidation:\n- env UV_CACHE_DIR=/private/tmp/nexus-api-gen-uv-cache uv run pyright temporalio/converter temporalio/nexus/system temporalio/worker/_workflow_instance.py tests/nexus/test_temporal_system_nexus.py tests/test_converter.py tests/worker/test_visitor.py\n- env UV_CACHE_DIR=/private/tmp/nexus-api-gen-cache uv run -m pytest tests/test_converter.py::test_temporal_intermediate_payload_converter_wraps_user_converter tests/nexus/test_temporal_system_nexus.py tests/worker/test_visitor.py -q