refactor: comentarii strict functionale, fara referinte PRD/stories

Curatare globala a comentariilor si docstring-urilor (app, tools, teste,
scripturi): eliminate referintele la PRD-uri, US-xxx, task-uri istorice si
review-uri; pastrata doar informatia functionala, formulata scurt. Regula
adaugata in CLAUDE.md (sectiunea Stil). Fara modificari de cod sau comportament.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/test_import_errors.py

@@ -1,4 +1,4 @@
-"""Teste US-005 (PRD 5.4): erori de import imbracate pe 3 niveluri.
+"""Teste erori de import imbracate pe 3 niveluri.
 
 Verifica ca fiecare HTTPException de import in scop are `detail` superset:
   - cheile vechi: `error`, `message`, context specific (sheets/found/n_ok)
@@ -327,7 +327,6 @@ class TestOverrideIlizibil3Niveluri:
         assert r.status_code == 422, f"Asteptat 422, primit {r.status_code}: {r.text}"
         detail = r.json()["detail"]
 
-        # Dupa US-005: detail trebuie sa fie dict, nu string
         assert isinstance(detail, dict), f"detail trebuie sa fie dict, primit: {type(detail)}"
         assert detail.get("error") == "override_ilizibil"
         assert detail.get("cod") == "IMPORT_OVERRIDE_ILIZIBIL"