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
e6ee700825