feat(report): restructure Gemini analysis and overview documentation

Update Gemini response schema to extract detailed overview, logic steps, data dependencies, and
consultation insights.
Add pipeline processing logic and file categorization explanations to OVERVIEW.md.

tests/test_pipeline.py

@@ -108,6 +108,12 @@ class PipelineTests(unittest.TestCase):
             self.assertFalse((output_root / "Scripts" / "Drop.bas").exists())
             self.assertTrue((output_root / "Flows" / "Active.xaml.analysis.md").exists())
 
+            overview = (output_root / "OVERVIEW.md").read_text(encoding="utf-8")
+            self.assertIn("## Processing Logic", overview)
+            self.assertIn("Initial Scan", overview)
+            self.assertIn("## How To Read This Output", overview)
+            self.assertIn("## Cleaned XAML Files", overview)
+
 
 if __name__ == "__main__":
     unittest.main()