lro response generation fix

[Libba Lawrence (l0lawrence)]

fixes #11966, to go out with next emitter release

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npm i https://pkg.pr.new/@typespec/http-client-python@12024

commit: 37561bb

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All changed packages have been documented.

• ✅ @typespec/http-client-python

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@typespec/http-client-python - fix ✏️

Return long-running operation response bodies when generating TypedDict-only models.

[github-actions]

Python emitter diff

Baseline gh:8185611ef9b746984adfa0a4011d45f91731c4a1 vs this PR.

No changes to generated output.

Rendered diff: inline on the run summary, or the emitter-diff-html artifact.

Informational check (eng/emitter-diff); does not block the PR.

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Copilot review overview

🟡 Changes recommended

Add emitter-level coverage validating the shipped generated LRO response binding.

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• Add emitter-level coverage for generated LRO response binding · New

What changed in this PR

Fixes Python LRO response deserialization for TypedDict-only clients by ensuring response binding is generated and adding regression coverage.

Changes:

• Updates LRO response binding generation.
• Adds parameterized regression tests.
• Documents the Python emitter fix.

File	Summary
packages/​http-client-python/​tests/​unit/​test_lro_response.py	Adds regression coverage; emitter-level generation coverage is still needed.
packages/​http-client-python/​generator/​pygen/​codegen/​serializers/​builder_serializer.py	Binds the HTTP response for LRO deserialization.
.chronus/​changes/​python-lro-typeddict-response-2026-09-21.md	Documents the bug fix.

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