ParsedRelease is now @dataclass(frozen=True). The enrichment passes that
used to patch fields in place now produce new instances:
- enrich_from_probe(parsed, info, kb) returns a new ParsedRelease via
dataclasses.replace (no allocation when no field changed).
- inspect_release rebinds 'parsed' after detect_media_type (wrapped in
MediaTypeToken — the strict isinstance check now also runs on
replace) and after enrich_from_probe.
languages becomes a tuple[str, ...] so the VO is properly immutable.
Parser pipeline packs languages as a tuple in the assemble dict.
Callers updated: inspect_release, testing/recognize_folders_in_downloads.py.
Tests updated: 22 enrich_from_probe call sites rebound, language
assertions switched to tuple literals, test_release_fixtures normalizes
result['languages'] back to list for YAML-fixture comparison.
Suite: 1077 passed.
francwa
b7979c0f8b