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_account_status.py

@@ -1,4 +1,4 @@
-"""Teste US-004 (PRD 5.5): model de stare a contului `accounts.status` + helperi.
+"""Teste model de stare a contului `accounts.status` + helperi.
 
 Acopera: derivarea status din active la migrare, invariantul active=1 <=> status='active',
 helperii set_status/delete_account, protectia contului de sistem id=1, excluderea 'deleted'
@@ -94,7 +94,7 @@ def test_delete_purjeaza_pii_si_elibereaza_cui(conn):
     """Stergerea soft purjeaza creds RAR + revoca cheile API + elibereaza CUI (re-inregistrabil)."""
     from app.accounts import create_account, delete_account, list_accounts
     acct_id = create_account(conn, "Service GDPR", cui="RO12345", active=True)
-    # US-013: creds in sloturi per-env (rar_creds_enc legacy dropata)
+    # creds in sloturi per-env
     conn.execute(
         "UPDATE accounts SET rar_creds_test_enc='secret_enc_test', rar_creds_prod_enc='secret_enc_prod' WHERE id=?",
         (acct_id,),
@@ -138,7 +138,6 @@ def test_migrare_deriva_status_din_active(conn):
     from app.db import _migrate
 
     # Reconstruim accounts fara `status` (rebuild de tabela — singura cale in SQLite vechi).
-    # US-013: rar_creds_enc nu mai exista in accounts (dropata); nu e in legacy DDL.
     conn.executescript(
         """
         PRAGMA foreign_keys=OFF;