Orphan detection now only removes provisional units created by release
parsing that carry no metadata trace (field sources, overrides, title,
air date, total source) and whose entity has no accepted external
identity, or that fall outside the entity's external season/episode
layout. TMDB ledger units are never deleted. Dry-run output lists
deletions and kept units by category; --dry-run is explicit and
mutually exclusive with --apply; audit payload records each orphan.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
