9ba084107b
tests/test_isr.py: - Remove unused imports: io, SimpleNamespace, call - Remove test_mp3_chunks_written_to_file — it mocked connect_stream but never called record(), making all the mock scaffolding dead; the actual assertion (bytes written to a file) is already covered by TestAudioFileWriter and TestGenerateFilename isr.py: - Update AudioDevice.backend comment: only the ALSA backend exists now Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>