feat(releases): Phase 1 — new filesystem release domain + TmdbId VO
First step of specs/dot_alfred_v2.md. Introduces a separate bounded context (alfred/domain/releases/) for the filesystem-side aggregates, disjoint from TMDB identity which stays in tv_shows/ and movies/. The link between the two worlds is TmdbId, used as the natural key in the persistence layer (no domain-level reference). New package alfred/domain/releases/: - value_objects: EpisodeRange (covers SxxE01E02E03 multi-episode files via start/end inclusive range, with count/numbers/is_single helpers), ReleaseMode enum (PACK = N video files direct in the season folder, EPISODIC = N sub-folders). - entities: TrackProfile, EpisodeRelease, SeasonRelease (with episode_count() summing each EpisodeRange.count()), SeriesRelease (tmdb_id primary anchor, optional imdb_id secondary), MovieRelease. All frozen dataclasses. - builders: SeasonReleaseBuilder + SeriesReleaseBuilder mirroring the v1 TVShowBuilder pattern. Builders sort episodes by range start on emit and reject overlapping ranges (two files claiming the same TMDB slot). from_existing() seeds a builder from an existing frozen aggregate for round-trip edits. - repositories: abstract ports (SeriesReleaseRepository, MovieReleaseRepository); concrete .alfred sidecar impls arrive in Phase 2. New shared VO alfred/domain/shared/value_objects.py::TmdbId — positive int, rejects bool/str/float, symmetric with the existing ImdbId VO. 73 unit tests cover VO validation, entity invariants, builder sort + overlap detection, and from_existing() round-trips. v1 code paths are untouched at this stage; the new domain coexists with the old TVShow aggregate until Phase 3 refactors it.
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