feat(config): parse enabled + compare_against

tests/pilot/test_ai_review.py

@@ -400,11 +400,11 @@ def test_parse_repo_config_full():
 
 
 def test_parse_repo_config_partial_and_bad():
-    assert parse_repo_config('{"focus":"not-a-list"}') == {}
-    assert parse_repo_config('{"focus":["ok"]}') == {"focus": ["ok"]}
+    assert parse_repo_config('{"focus":"not-a-list"}') == {"enabled": False}
+    assert parse_repo_config('{"focus":["ok"]}') == {"focus": ["ok"], "enabled": False}
     assert parse_repo_config("") == {}
     assert parse_repo_config("not json") == {}
-    assert parse_repo_config('{"instructions":"   "}') == {}
+    assert parse_repo_config('{"instructions":"   "}') == {"enabled": False}
 
 
 # ---------------------------------------------------------------------------
@@ -895,7 +895,10 @@ def test_parse_repo_config_still_accepts_normal_config():
     cfg = parse_repo_config(json.dumps({
         "focus": ["security"], "languages": ["go"], "instructions": "No bare throw.",
     }))
-    assert cfg == {"focus": ["security"], "languages": ["go"], "instructions": "No bare throw."}
+    assert cfg == {
+        "focus": ["security"], "languages": ["go"], "instructions": "No bare throw.",
+        "enabled": False,
+    }
 
 
 # ---------------------------------------------------------------------------
@@ -917,7 +920,7 @@ def test_fetch_repo_config_uses_given_base_ref(monkeypatch):
 
     monkeypatch.setattr(ai_review, "gitea_get", fake_get)
     cfg = ai_review.fetch_repo_config("http://g", "o/r", "tok", ref="main")
-    assert cfg == {"focus": ["security"]}
+    assert cfg == {"focus": ["security"], "enabled": False}
     assert seen["path"] == "contents/.pr-review.json?ref=main"
 
 
@@ -1755,3 +1758,56 @@ def test_severity_badge_labels_each_known_severity():
         badge = _severity_badge(sev)
         assert f"[{sev.upper()}]" in badge, (sev, badge)
 
+
+# ---------------------------------------------------------------------------
+# parse_repo_config — `enabled` (kill-switch) + `compare_against` (cost roster)
+# ---------------------------------------------------------------------------
+
+
+def test_parse_repo_config_enabled_true():
+    cfg = parse_repo_config('{"enabled": true}')
+    assert cfg.get("enabled") is True
+
+
+def test_parse_repo_config_enabled_false_explicit():
+    cfg = parse_repo_config('{"enabled": false}')
+    assert cfg.get("enabled") is False
+
+
+def test_parse_repo_config_enabled_missing_defaults_false():
+    cfg = parse_repo_config('{}')
+    assert cfg.get("enabled") is False
+
+
+def test_parse_repo_config_enabled_wrong_type_ignored():
+    cfg = parse_repo_config('{"enabled": "yes"}')
+    assert cfg.get("enabled") is False
+
+
+def test_parse_repo_config_compare_against_default_absent():
+    # absent in returned cfg; defaults applied in render, not parse_repo_config
+    cfg = parse_repo_config('{}')
+    assert "compare_against" not in cfg
+
+
+def test_parse_repo_config_compare_against_valid():
+    cfg = parse_repo_config(
+        '{"compare_against": ["claude-sonnet-5", "gpt-5", "gemini-2.5-pro"]}')
+    assert cfg["compare_against"] == ["claude-sonnet-5", "gpt-5", "gemini-2.5-pro"]
+
+
+def test_parse_repo_config_compare_against_drops_unknown_keys(capfd):
+    cfg = parse_repo_config(
+        '{"compare_against": ["claude-sonnet-5", "bogus-1", "gpt-5"]}')
+    assert "bogus-1" not in cfg["compare_against"]
+    assert "claude-sonnet-5" in cfg["compare_against"]
+    captured = capfd.readouterr()
+    assert "bogus-1" in captured.err
+
+
+def test_parse_repo_config_compare_against_caps_at_12():
+    raw_keys = ["claude-sonnet-5"] + [f"bogus-{i}" for i in range(20)]
+    cfg = parse_repo_config(json.dumps({"compare_against": raw_keys}))
+    # Only claude-sonnet-5 is valid; rest dropped; net result is 1 entry.
+    assert len(cfg["compare_against"]) == 1
+