docs(changelog): recap session 2026-05-20 tech-debt cleanup

Consolidate the five domain-purity refactors of the session under
[Unreleased]: RuleScopeLevel enum, FilePath VO post_init, Language
strict + from_raw, ParsedRelease.normalised → clean, ParsedRelease
enum strictness. Removes the duplicate min_movie_size_bytes entry
(now sits under its proper Removed section).

CHANGELOG.md

@@ -15,17 +15,6 @@ callers).
 
 ## [Unreleased]
 
-### Removed
-
-- **`settings.min_movie_size_bytes` retiré.** Le champ Pydantic + son
-  validator n'avaient plus aucun consommateur (l'ancien
-  `MovieService.validate_movie_file` ayant été supprimé lors d'une
-  refonte précédente). La règle "est-ce un vrai film ou un sample"
-  est désormais portée par l'exclusion par extension
-  (`application/release/supported_media.py`) et le PoP. Si on a un
-  jour besoin d'un seuil de taille, il ira dans un YAML knowledge,
-  pas dans `settings`.
-
 ### Fixed
 
 - **Multi-episode chain (e.g. `S14E09E10E11`) now collapses to a full
@@ -66,6 +55,48 @@ callers).
   depends on the Protocol, infrastructure provides the YAML-backed
   adapter. Tests in `tests/infrastructure/test_language_registry.py`.
 
+### Changed
+
+- **`RuleScope.level` is now an enum (`RuleScopeLevel`).** The set of
+  valid levels (global, release_group, movie, show, season, episode)
+  was documented only in a docstring comment and validated nowhere.
+  `RuleScopeLevel(str, Enum)` keeps wire compatibility (YAML
+  serialization, `.value` access) while making the closed set explicit
+  to type-checkers and IDEs. `to_dict()` emits `.value` strings so
+  YAML output is unchanged.
+- **`FilePath` VO uses `__post_init__` instead of a hand-rolled
+  `__init__`.** Same public API (accepts `str | Path`), same behavior,
+  but the dataclass-generated `__init__` is no longer bypassed. One
+  less smell in the shared VOs.
+- **`Language` VO is strict by default; `Language.from_raw()` factory
+  for normalization.** The previous `__post_init__` mutated `iso` and
+  `aliases` via `object.__setattr__` on a frozen dataclass — a code
+  smell hiding behind the dataclass facade. Split: the direct
+  constructor now rejects un-normalized input (uppercase iso,
+  whitespace in aliases, etc.), and `Language.from_raw()` handles
+  arbitrary YAML/user input. Only one caller (LanguageRegistry loading
+  the ISO YAML) needed migration.
+- **`ParsedRelease.normalised` renamed to `clean`.** The field name
+  promised "dots instead of spaces" but in practice held
+  `raw - site_tag - apostrophes` — only used by `season_folder_name()`.
+  Renamed and docstring corrected.
+- **`ParsedRelease.media_type` / `parse_path` are strict enums.** The
+  fields were already typed as `MediaTypeToken` / `ParsePath`, but a
+  tolerant `__post_init__` coerced raw strings. With both classes
+  being `(str, Enum)`, the coercion served no purpose. Strict
+  constructor; `.value` no longer passed at call sites; dropped the
+  unused `_VALID_MEDIA_TYPES` / `_VALID_PARSE_PATHS` lookup tables.
+
+### Removed
+
+- **`settings.min_movie_size_bytes`** — orphan Pydantic field +
+  validator. Its only consumer (`MovieService.validate_movie_file`)
+  had been removed during an earlier refactor. The "real movie vs
+  sample" rule now lives in extension-based exclusion
+  (`application/release/supported_media.py`) and PoP. If a size
+  threshold is ever needed, it'll go in a knowledge YAML, not in
+  `settings`.
+
 ### Internal
 
 - **Flattened `alfred.domain.shared.media/` package into a single