feat(review): walkthrough/risk_verdict/test_coverage schema

tests/pilot/test_ai_review.py

@@ -479,9 +479,9 @@ def test_parse_review_output_bare_findings_no_summary():
 
 
 def test_parse_review_output_empty_and_bogus():
-    assert parse_review_output("") == ("", [], [], [])
-    assert parse_review_output("no json here") == ("", [], [], [])
-    assert parse_review_output('{"findings":[]}') == ("", [], [], [])
+    assert parse_review_output("") == ("", [], [], [], [], "", "")
+    assert parse_review_output("no json here") == ("", [], [], [], [], "", "")
+    assert parse_review_output('{"findings":[]}') == ("", [], [], [], [], "", "")
 
 
 def test_parse_review_output_uses_last_json_block():
@@ -565,6 +565,44 @@ def test_parse_review_output_bare_array_at_tail():
     assert len(fs) == 1
 
 
+def test_parse_review_output_extracts_walkthrough_risk_tests():
+    # The 7-tuple shape carries three new top-level fields:
+    # walkthrough (list[str]), risk_verdict (str), test_coverage (str).
+    txt = (
+        "```json\n"
+        "{\n"
+        '  "summary": "x",\n'
+        '  "summary_changes": [],\n'
+        '  "risks": [],\n'
+        '  "walkthrough": ["a.py: adds X", "b.py: refactors Y"],\n'
+        '  "risk_verdict": "Low risk.",\n'
+        '  "test_coverage": "No tests for behavioral change in a.py.",\n'
+        '  "findings": []\n'
+        "}\n"
+        "```"
+    )
+    summary, findings, _changes, _risks, walkthrough, risk_verdict, test_coverage = (
+        parse_review_output(txt)
+    )
+    assert summary == "x"
+    assert findings == []
+    assert walkthrough == ["a.py: adds X", "b.py: refactors Y"]
+    assert risk_verdict == "Low risk."
+    assert test_coverage == "No tests for behavioral change in a.py."
+
+
+def test_parse_review_output_missing_fields_default_empty():
+    # Backward-compatible: the 4-tuple shape still parses fine; the new
+    # fields default to empty list / empty string.
+    out = parse_review_output('{"summary":"x","findings":[]}')
+    summary, findings, _changes, _risks, walkthrough, risk_verdict, test_coverage = out
+    assert summary == "x"
+    assert findings == []
+    assert walkthrough == []
+    assert risk_verdict == ""
+    assert test_coverage == ""
+
+
 def test_scan_balanced_handles_braces_in_strings():
     # The JSON scanner must not be fooled by `{` or `}` inside string literals.
     s = '{"a":"contains { and }","b":1}'