feat(referentials): validation ATIH 2018 des codes médicaux

Ajoute une couche de validation post-extraction contre les référentiels
officiels de l'ATIH (Agence Technique de l'Information sur
l'Hospitalisation) pour 2018. Zéro tolérance sur les codes T2A : un
code invalide est flaggé, et une correction par plus proche voisin
(Levenshtein ≤ 1) est proposée.

Contenu :
- pipeline/referentials.py : API publique is_valid_{cim10,ccam,ghm,ghs},
  get_cim10_libelle, nearest_cim10, ghm_to_ghs. CLI --build/--test/--stats.
- pipeline/validation.py    : annote un JSON d'extraction avec un bloc
  `_validation` par page (codes valides/invalides + suggestions + cross-
  checks GHM↔GHS).
- referentials/sources/     : données brutes ATIH publiques (CIM-10 ClaML
  2019 substitut, CCAM v5 2018, GHM v2018, tarifs fév. 2018).
- referentials/atih_2018.sqlite : base SQLite prête à l'emploi
  (11 623 CIM-10 · 8 147 CCAM · 2 593 GHM · 5 329 couples GHM→GHS).
- tests/test_referentials.py : 11 tests unitaires (11/11 passent).
- annotate_validation.py    : script qui annote tous les JSONs V2 en
  place et produit validation_report.md.

Note CIM-10 : la version 2018 ATIH n'est publiée qu'en PDF, ClaML 2019
est utilisée en substitut (écart connu ≈ 60 codes / 11 600).

Gestion des suffixes PMSI : `*` (CMA exclue par le DP) et `+N`
(extension PMSI) sont strippés avant validation, le code racine seul
est comparé au référentiel.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

referentials/sources/cim10_claml_2019_extracted/ClaML.dtd

@@ -0,0 +1,283 @@
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