refactor(audio): derive sample rate from settings

[gaspardpetit]

Summary

• replace hard-coded 16 kHz conversions in transcript formatting with AUDIO_PARAMS.sample_rate
• use shared audio settings in voice-processing modules and main pipeline logic
• update tests to honor configurable sample rate

Testing

• make check
• python -m unittest discover -s tests -p 'test_audio*.py' -q
• python -m unittest discover -s tests -p 'test_stereo_diarization.py' -q
• python -m unittest discover -s tests -p 'test_transcript*.py' -q
• ⚠️ python -m unittest discover -s tests -p 'test_window.py' -q (missing torch dependency)

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https://chatgpt.com/codex/tasks/task_e_68b5a8e4cbcc832c9d044492632fd0a1

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
verbatim
__init__.py
config.py
main.py
verbatim.py					371-376, 555, 609-616
verbatim/audio
audio.py
verbatim/audio/sources
audiosource.py
factory.py
ffmpegfileaudiosource.py
fileaudiosource.py					33-38
micaudiosource.py					7-13, 85-89, 151-158
pcmaudiosource.py					4-10, 71
wavsink.py					3-20
verbatim/transcript
sentences.py
verbatim/transcript/format
docx.py					8-17, 77-100
json.py					29
md.py					4-12, 128-151
txt.py					93, 96-105, 108-112
verbatim/voices
diarization.py
isolation.py					20-22, 68-82
verbatim/voices/diarize
factory.py
pyannote.py
stereo.py
verbatim/voices/transcribe
faster_whisper.py
whisper.py					6-14, 144-149
whispermlx.py					7-15, 129-134, 141-147, 170
Project Total

The report is truncated to 25 files out of 30. To see the full report, please visit the workflow summary page.

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