Mirror the MediaProber / FilesystemScanner pattern for language lookup:
- New Protocol `LanguageRepository` in alfred.domain.shared.ports
covering from_iso, from_any, all, __contains__, __len__ — the
surface previously coupled to the concrete LanguageRegistry.
- SubtitleKnowledgeBase types its `language_registry` parameter
against the Protocol; the concrete LanguageRegistry stays in
infrastructure as the YAML-backed adapter and remains the default
when no repository is injected.
- New unit tests in tests/infrastructure/test_language_registry.py
cover the adapter surface (from_iso, from_any, membership,
case-insensitivity, non-string inputs).
Behaviour is unchanged for existing callers. The split opens the
door to in-memory fakes in future tests without loading the full
ISO 639 YAML.
Add probe(video) -> MediaInfo | None to the MediaProber Protocol and
implement it on FfprobeMediaProber. The standalone
alfred/infrastructure/filesystem/ffprobe.py module is removed; all
callers (analyze_release / probe_media tools, testing scripts) now go
through the adapter.
Tests for the probe path moved to tests/infrastructure/test_ffprobe_prober.py
(patching subprocess.run at the adapter module level).
Unblocks the upcoming inspect_release orchestrator, which needs the
port — not a free function — to compose parse + main-video selection
+ probe in one shot.
Domain services no longer call subprocess or pathlib directly. Introduces
two Protocol ports in domain/shared/ports/:
MediaProber.list_subtitle_streams(video) -> list[SubtitleStreamInfo]
FilesystemScanner.scan_dir / stat / read_text -> list[FileEntry] | ...
Concrete adapters live in infrastructure/:
FfprobeMediaProber (wraps subprocess + ffprobe + JSON)
PathlibFilesystemScanner (wraps pathlib + os reads)
SubtitleIdentifier and PatternDetector now take (kb, prober, scanner) at
construction time. Their internals work over FileEntry snapshots and
SubtitleStreamInfo records — no more ad-hoc Path.is_file/iterdir/stat or
embedded subprocess.run loops. _count_entries now takes raw SRT text
(returned by scanner.read_text) so SRT-only entry counting stays out of
the FS layer.
manage_subtitles use case instantiates the two adapters once and injects
them into both services. Tests pass real adapters and patch
`alfred.infrastructure.probe.ffprobe_prober.subprocess.run` for the
ffprobe-failure cases. _classify_single tests build FileEntry via a
small helper.
Domain is now free of subprocess / direct filesystem reads in the
subtitle pipeline. The only remaining I/O hooks are FilePath VO
convenience methods (exists/is_file/is_dir) which stay as a deliberate
affordance on the value object.
francwa