feat: метрики качества — арифметика (sum==price*qty) + частота JSON-фиксов

deploy/services/process.py

@@ -1,6 +1,7 @@
 """Process service — SSE pipeline: reset → supplements → LLM → apply."""
 import json, time, threading
 from db import supplements, spec_current, spec_events
+from .metrics import check_arithmetic
 
 
 def run_pipeline(contract_id, order_ids, sse_send, build_prompt_fn):
@@ -108,6 +109,10 @@ def run_pipeline(contract_id, order_ids, sse_send, build_prompt_fn):
         summary = spec_events.apply_ops(
             contract_id, sid, s.get("document_id", ""), ops, prompt_id, llm_result
         )
+        # Arithmetic quality check (free signal, no golden dataset needed)
+        arith_mismatches = check_arithmetic(ops)
+        if arith_mismatches:
+            summary["arithmetic_mismatches"] = len(arith_mismatches)
         sse_send({"type": "applied", "supplement_id": sid, "summary": summary, "ops": ops})
 
     total_time = round(time.time() - t0, 1)