Verify exact production traces and record rollout

apps/ai-service/rag/grounding.py

@@ -41,6 +41,8 @@ from __future__ import annotations
 import re
 from dataclasses import dataclass
 
+from .telemetry import traced_stage
+
 # A digit run with internal separators kept: "500", "7,5", "1.000".
 # Ranges ("4 - 6 giờ") yield two tokens, and each is checked on its own.
 _NUMBER = re.compile(r"\d+(?:[.,]\d+)*")
@@ -127,6 +129,7 @@ def split_claims(answer: str, evidence_count: int) -> tuple[Claim, ...]:
     return tuple(claims)
 
 
+@traced_stage("grounding")
 def verify(answer: str, evidence_texts: tuple[str, ...]) -> GroundingReport:
     """Whether `answer` states only figures and sources traceable to the
     specific evidence block(s) cited immediately after each claim.