fix(6d83-b949): reject low scores on dimensions with no findings in review validator

The review validator allowed dimensions with zero findings to have
arbitrarily low scores (e.g., correctness=2 with no correctness findings).
Per scoring rules, "no findings → score 4-5". Added validation that
dimensions with no findings must score 4 or higher.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: JoeOakhartNava

plugins/dso/scripts/validate-review-output.sh

@@ -289,6 +289,14 @@ if isinstance(findings, list) and isinstance(scores, dict):
                 f"this dimension are severity='minor', which requires score 4-5 "
                 f"(score 3 is reserved for important findings)"
             )
+    # No-findings low-score check (6d83-b949): if a dimension has no findings
+    # at all, its score must be 4 or 5 per scoring rules ("no findings → score 4-5").
+    for dim, score in scores.items():
+        if dim not in dim_severities and isinstance(score, (int, float)) and score < 4:
+            errors.append(
+                f"score '{dim}'={score} violates scoring rules: this dimension has "
+                f"no findings, which requires score 4-5"
+            )
 
 # Validate summary
 summary = data.get("summary")

tests/hooks/test-validate-review-output.sh

@@ -211,7 +211,7 @@ VALID_CRD_FILE=$(write_fixture "valid-crd.json" '{
     "design": 4,
     "maintainability": 4,
     "correctness": 4,
-    "verification": 3
+    "verification": 4
   },
   "findings": [],
   "summary": "Code is well-structured and tests are adequate."
@@ -692,7 +692,7 @@ assert_ne \
 NEW_DIM_VALID_FILE=$(write_fixture "new-dim-valid.json" '{
   "scores": {
     "correctness": 4,
-    "verification": 3,
+    "verification": 4,
     "hygiene": 4,
     "design": 4,
     "maintainability": 5
@@ -948,4 +948,27 @@ assert_contains \
     "SCHEMA_VALID: no" \
     "$INVALID_RISK_CATEGORY_OUTPUT"
 
+# =============================================================================
+# Test: no-findings dimension with low score should be rejected (6d83-b949)
+# Scoring rules: "Minor only or no findings → score 4-5"
+# A dimension with zero findings and score < 4 is a scoring error.
+# =============================================================================
+echo ""
+echo "--- test_no_findings_dimension_low_score_rejected ---"
+_snapshot_fail
+
+_NO_FINDINGS_LOW_SCORE_FILE=$(write_fixture "no_findings_low_score.json" '{
+  "scores": {"hygiene": 5, "design": 5, "maintainability": 5, "correctness": 2, "verification": 4},
+  "findings": [
+    {"severity": "minor", "category": "verification", "description": "Minor test coverage gap", "file": "a.sh"}
+  ],
+  "summary": "All findings are minor but correctness scored low with no correctness findings."
+}')
+_NO_FINDINGS_LOW_SCORE_EXIT=$(run_script code-review-dispatch "$_NO_FINDINGS_LOW_SCORE_FILE")
+assert_ne "test_no_findings_dimension_low_score_rejected" "0" "$_NO_FINDINGS_LOW_SCORE_EXIT"
+_NO_FINDINGS_LOW_SCORE_OUTPUT=$(bash "$SCRIPT" code-review-dispatch "$_NO_FINDINGS_LOW_SCORE_FILE" 2>&1 || true)
+assert_contains "test_no_findings_dimension_low_score_error_message" "no findings" "$_NO_FINDINGS_LOW_SCORE_OUTPUT"
+
+assert_pass_if_clean "test_no_findings_dimension_low_score_rejected"
+
 print_summary