feat(backend): parse-835 JSON response includes reconciliation summary

backend/src/cyclone/api.py

@@ -303,6 +303,40 @@ def _has_835_validation_errors(result: ParseResult835) -> bool:
     return result.validation is not None and not result.validation.passed
 
 
+def _reconciliation_summary_for_batch(batch_id: str) -> dict:
+    """Return ``{matched, unmatched_claims, unmatched_remittances, skipped}`` for a batch.
+
+    Reads from the DB after ``store.add()`` has already triggered T10
+    reconciliation synchronously (via ``_run_reconcile``). Counts are
+    observed at this moment; a subsequent manual match/unmatch will not
+    be reflected until the next request.
+
+    ``skipped`` is reserved for future use — the T10 orchestrator tracks
+    skipped claims internally but does not surface a queryable count.
+    """
+    from sqlalchemy import func, select
+    from cyclone import db
+    from cyclone.db import Match, Remittance
+
+    with db.SessionLocal()() as s:
+        matched = s.execute(
+            select(func.count(Match.id)).where(
+                Match.remittance_id.in_(
+                    select(Remittance.id).where(Remittance.batch_id == batch_id)
+                )
+            )
+        ).scalar_one()
+
+    # Pull unmatched via the store (small result set; cheap).
+    unmatched = store.list_unmatched(kind="both")
+    return {
+        "matched": matched,
+        "unmatched_claims": len(unmatched["claims"]),
+        "unmatched_remittances": len(unmatched["remittances"]),
+        "skipped": 0,  # reserved — T10 does not persist a skipped count
+    }
+
+
 @app.post("/api/parse-835")
 async def parse_835_endpoint(
     request: Request,
@@ -384,7 +418,9 @@ async def parse_835_endpoint(
     store.add(rec)
 
     if _client_wants_json(request):
-        return JSONResponse(content=json.loads(result.model_dump_json()))
+        body = json.loads(result.model_dump_json())
+        body["reconciliation"] = _reconciliation_summary_for_batch(rec.id)
+        return JSONResponse(content=body)
 
     # Default: NDJSON stream.
     return StreamingResponse(