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CH58x has no isochronous support (dcd_edpt_iso_alloc() returns false), but the audio class ignores that result and the endpoints fall back to capped 64-byte non-iso transfers, producing non-functional audio firmware. video_capture and the FreeRTOS audio examples already carry mcu:CH58X; add it to the remaining iso examples (audio_test, audio_4_channel_mic, audio_test_multi_rate, cdc_uac2, uac2_headset, uac2_speaker_fb) so they are not built for CH58x. Found by Codex review. Verified via build_utils.skip_example() that all six now skip on ch582m_evt while control examples (e.g. cdc_msc) still build. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>