Accept GOOGLE_API_KEY for local Gemini eval

This workspace uses GOOGLE_API_KEY as the canonical Google credential. Accept it ahead of the Gemini-specific aliases so the local evaluation harness can run without a separate GEMINI_API_KEY export.

Validation: uv run python -m unittest tests.test_env_project tests.test_evaluate_search_quality and a one-shot keychain-backed resolution check.

tests/test_env_project.py

@@ -96,6 +96,21 @@ class TestConfigPrecedence(unittest.TestCase):
                 self.assertEqual(config['GEMINI_API_KEY'], 'gem-key')
                 self.assertEqual(config['GEMINI_MODEL'], 'gemini-3-pro-preview')
 
+    def test_google_api_key_loads_from_project_env(self):
+        import tempfile
+        with tempfile.TemporaryDirectory() as tmpdir:
+            project_dir = Path(tmpdir) / ".claude"
+            project_dir.mkdir()
+            project_env = project_dir / "last30days.env"
+            project_env.write_text("GOOGLE_API_KEY=google-key\n")
+
+            with patch.object(Path, 'cwd', return_value=Path(tmpdir)), \
+                 patch.object(env, 'CONFIG_FILE', None), \
+                 patch.dict(os.environ, {}, clear=False):
+                os.environ.pop('GOOGLE_API_KEY', None)
+                config = env.get_config()
+                self.assertEqual(config['GOOGLE_API_KEY'], 'google-key')
+
 
 class TestConfigSource(unittest.TestCase):
     """Tests for _CONFIG_SOURCE tracking."""