Movie and Episode become @dataclass(frozen=True, eq=False), with
audio_tracks/subtitle_tracks held as tuple[...] instead of list[...].
Identity-based equality is preserved via the existing __eq__/__hash__.
__post_init__ coercion (imdb_id, title, season_number, episode_number)
uses object.__setattr__ to stay compatible with frozen.
The MediaWithTracks mixin contract is updated to tuple accordingly.
Callers projecting enrichment results (probe output, file metadata) now
rebuild via dataclasses.replace(...) — same pattern recently adopted for
ParsedRelease.
Season and TVShow stay mutable for now: freezing the aggregate root
would cascade a full reconstruction on every add_episode, deferred.
francwa
02e478a157