AC-0023: filter C-case quantity mismatch slots from strategy RPC, fail-closed on warn_store failure, symbol-aggregate verify clear

Co-authored-by: genichin <4282227+genichin@users.noreply.github.com>

trex_core/application/portfolio.py

@@ -391,6 +391,13 @@ class ReconcileWarningStore(Protocol):
         """
         ...
 
+    def list_c_case_warned(self) -> "set[str]":
+        """Return set of slot_id strings that have an active case_code='C' warning.
+
+        AC-0023: used by strategy slots RPC to exclude C-case mismatched holding slots.
+        """
+        ...
+
 
 class InMemoryReconcileWarningStore:
     """Process-local reconcile-warning store for tests + CI (REQ-102)."""
@@ -434,6 +441,10 @@ class InMemoryReconcileWarningStore:
             info = self._warned.get(slot_id)
             return dict(info) if info is not None else None
 
+    def list_c_case_warned(self) -> "set[str]":
+        with self._lock:
+            return {sid for sid, info in self._warned.items() if info.get("case_code") == "C"}
+
 
 def slot_to_dict(
     s,