fix(issue-filing): enforce mutation-scope denials in generic loop (#191)

The forbidden-mutation loop in assess_issue_filing_mutation_scope never
appended reasons; align aggregation with issue-selection handoff checks.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

review_proofs.py

@@ -2282,18 +2282,22 @@ def assess_issue_filing_mutation_scope(
                 "comment_issue", "create_issue",
             ):
                 continue
-            if absent in text and f"no {absent}" not in text:
-                if any(
-                    phrase in text
-                    for phrase in (
-                        f"no {absent}",
-                        f"no {absent}s",
-                        f"without {absent}",
-                        "none performed",
-                        "none.",
-                    )
-                ):
-                    continue
+            if absent not in text:
+                continue
+            denial_phrases = (
+                f"no {absent}",
+                f"no {absent}s",
+                f"without {absent}",
+                "none performed",
+                "none.",
+                "confirm no",
+            )
+            if any(phrase in text for phrase in denial_phrases):
+                continue
+            reasons.append(
+                f"single-mutation run mentions '{absent}' without "
+                f"confirming it was not performed"
+            )
         if performed == ["create_issue"]:
             for check in ("label", "comment", "pr", "review", "merge"):
                 if check in text and f"no {check}" not in text:
@@ -2424,7 +2428,8 @@ def assess_issue_filing_final_report(
     reasons = []
     downgraded = False
     for name, result in checks.items():
-        if result.get("verdict") == "missing":
+        verdict = result.get("verdict")
+        if verdict in ("missing", "incomplete"):
             downgraded = True
             reasons.extend(result.get("reasons") or [])
         elif result.get("downgraded") or not result.get("complete", True):