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_worker_active_gate.py

@@ -1,9 +1,6 @@
-"""Teste US-008 — gate worker: claim_one sare submission-urile conturilor inactive.
+"""Teste gate worker: claim_one sare submission-urile conturilor inactive.
 
-TDD: testele se scriu INAINTE de modificarea claim_one; la inceput pica (RED),
-dupa modificare trec (GREEN).
-
-C14: LEFT JOIN accounts + COALESCE(a.active, 1) = 1
+LEFT JOIN accounts + COALESCE(a.active, 1) = 1:
  (a) cont legacy fara active -> COALESCE(NULL,1)=1 -> tratat ca activ
  (b) submissions.account_id IS NULL (ON DELETE SET NULL) -> LEFT JOIN lasa
      a.active NULL -> COALESCE(NULL,1)=1 -> tratat ca activ/default
@@ -126,7 +123,7 @@ def test_claim_account_null_tratat_activ(env):
 
 
 def test_claim_sare_cont_blocat(env):
-    """5.5: cont blocked -> claim_one nu ridica submission-ul."""
+    """Cont blocked -> claim_one nu ridica submission-ul."""
     from app.accounts import create_account, set_status
     from app.worker.__main__ import claim_one
 
@@ -140,7 +137,7 @@ def test_claim_sare_cont_blocat(env):
 
 
 def test_claim_sare_cont_arhivat(env):
-    """5.5: cont archived -> claim_one nu ridica submission-ul."""
+    """Cont archived -> claim_one nu ridica submission-ul."""
     from app.accounts import create_account, set_status
     from app.worker.__main__ import claim_one
 
@@ -154,7 +151,7 @@ def test_claim_sare_cont_arhivat(env):
 
 
 def test_deblocare_reia_trimiterea(env):
-    """5.5: blocked -> set_status('active') -> claim_one ridica din nou."""
+    """Blocked -> set_status('active') -> claim_one ridica din nou."""
     from app.accounts import create_account, set_status
     from app.worker.__main__ import claim_one