Fix Pyright type errors: use local variable for Optional narrowing

audit_trail.py: Bind self.log_path to local var before None guard
so Pyright can narrow the type (instance attrs aren't narrowed).
cui_detector.py: Prefix unused text param with underscore.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: marc-shade

docsingest/compliance/audit_trail.py

@@ -613,10 +613,11 @@ def _get_local_ip() -> str:
     def _append_to_log(self, entry: AuditEntry) -> None:
         """Append an entry to the audit log file."""
         try:
-            if self.log_path is None:
+            log_path = self.log_path
+            if log_path is None:
                 raise ValueError("log_path is required for file operations")
-            os.makedirs(os.path.dirname(os.path.abspath(self.log_path)), exist_ok=True)
-            with open(self.log_path, 'a', encoding='utf-8') as f:
+            os.makedirs(os.path.dirname(os.path.abspath(log_path)), exist_ok=True)
+            with open(log_path, 'a', encoding='utf-8') as f:
                 f.write(json.dumps(entry.to_dict(), separators=(',', ':')) + '\n')
         except Exception as e:
             logger.error("Failed to write audit entry to %s: %s", self.log_path, e)

docsingest/compliance/cui_detector.py

@@ -432,7 +432,7 @@ def _detect_dissemination_controls(self, text: str) -> List[DisseminationMarking
 
     def _check_marking_compliance(
         self,
-        text: str,
+        _text: str,
         cui_markings: List[CUIMarking],
         banners: List[ClassificationBanner],
         dissemination_controls: List[DisseminationMarking],