The feedpak spec (§7.1) defines the lyrics_source vocabulary as {authored, transcribed, user}, but the reader only accepted the legacy {xml, notechart, whisperx, user} set and silently downgraded anything else to "xml". A spec-compliant writer (e.g. the stem_splitter plugin, which emits transcribed for WhisperX-produced lyrics) therefore lost its provenance badge.
Widen the allowed set to the union of the spec vocabulary and the legacy values so both validate, and alias the legacy whisperx engine name to the spec transcribed so existing packs normalise to the spec badge.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Signed-off-by: topkoa <topkoa@gmail.com>
