Function meta_hash 

pub fn meta_hash(clip: &Clip, lineage: &LineageContext) -> String

A sentinel for the clip’s embedded tag set.

Hashes the resolved TrackMetadata actually written into the file (title, artist, album, date/year, lyrics, prompt, model, handle, and the resolved lineage tags), so a change to any embedded tag triggers a retag while a change to a non-embedded field (e.g. the animated-cover URL) does not. Taking TrackMetadata directly keeps it in lock-step with the tag writer: if a value is embedded, it is in this hash. Chosen art is tracked separately by art_hash, and the embedded aligned lyrics (Suno’s fetched alignment, not clip.lyrics) by ManifestEntry::embedded_lyrics_hash; both are the invariant’s two exceptions, embedded but fingerprinted outside this hash.

A pure path change is handled as a rename, by comparing the rendered path with the stored one, not by this hash.