test(voice): repair and re-enable turn-detection tests in CI

[brandonbodily]

Summary

Four test modules are marked pytest.mark.audio_eot, covering 83 tests of turn-detection behaviour:

Module	Tests
tests/test_audio_recognition_turn_detection.py	29
tests/test_audio_turn_detector_fallback.py	40
tests/test_turn_detection_fsm.py	11
tests/test_turn_detection_cloud_stream.py	3

CI runs make unit-tests → pytest --unit, which deselects all of them, and no workflow passes --audio_eot:

$ pytest tests/test_audio_recognition_turn_detection.py --unit
29 deselected in 0.06s

$ grep -rn "audio_eot" .github/
(no matches)

None of these 83 tests has been running in CI.

Consequence

test_audio_recognition_turn_detection.py drifted out of sync with the source. On a clean checkout of main, 8 of its 29 fail:

#	Test expects	Source has
1	AudioRecognition.update_turn_detector	_update_turn_detector (renamed private)
2	AudioRecognition.clear_user_turn	_clear_user_turn (renamed private)
3	_make_full_recognition_for_eou stub	missing _turn_backchannel_over_agent, _stt_consumer_atask
4	log assertion on "already flushed"	warning now reads "transcript arrives after turn has been committed"

Each is a one-line repair. The other three modules were already green — they simply never ran.

Changes

• Repair the four drift points.
• Add --audio_eot to the unit-tests target so these run alongside --unit.

No library code is touched — only the test module and the make target.

Verification

$ pytest --audio_eot          # before
8 failed, 75 passed

$ pytest --audio_eot          # after
83 passed

pytest --unit and pytest --unit --audio_eot produce identical results across every other test in the suite.

Why this matters beyond the repair

This is the coverage for turn-detection commit policy, which is where several open correctness issues live (#6504, #3515). With the suite green, adding a single assertion to the existing test_late_stt_final_after_flush_short_circuits reproduces #6504 deterministically:

ar._hooks.on_end_of_turn.assert_not_called()
# AssertionError: Expected 'on_end_of_turn' to not have been called. Called 2 times.

That test already drives the exact #6504 scenario — a late STT final after _turn_detector_flushed is set — and asserts on predict, on on_eot_prediction, and on the warning, but never on whether a turn is committed. The sibling test two functions below (test_predict_timeout_signals_fallback_and_drops_future) does assert on_end_of_turn.assert_called_once(), so the pattern is established in this file.

I've deliberately left that assertion out of this PR — it would fail until #6504 is fixed, and PR #6516 is already open against it. This PR is only the CI repair, so it lands independently and green.

Two other markers look dark, but I didn't touch them

While tracing this I noticed plugin (26 modules) and docs (1) are also never selected by any workflow — they're only reachable through tests/Makefile:unit-tests (--unit --plugin --evals --docs), and CI's make unit-tests step runs from the repo root, so it hits the root makefile target instead.

To be clear about what still does work: the plugin matrix isn't idle — tests/Makefile:test runs pytest --tts, and test_tts.py reads the PLUGIN env var (lines 286, 551) to filter its parametrized provider list, so each matrix job genuinely exercises that provider's TTS. What it doesn't run are the 26 dedicated test_plugin_* modules, including the *_stt.py ones.

I've left those out of this PR on purpose — re-enabling 26 provider-integration modules is a credentials-and-CI-cost decision for maintainers, not something to slip into a test repair. Happy to open a separate issue if that's useful.

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.