feat(mma): Integrate AST skeleton extraction into Tier 3 context build

aggregate.py

@@ -17,6 +17,7 @@ import glob
 from pathlib import Path, PureWindowsPath
 import summarize
 import project_manager
+from file_cache import ASTParser
 
 def find_next_increment(output_dir: Path, namespace: str) -> int:
     pattern = re.compile(rf"^{re.escape(namespace)}_(\d+)\.md$")
@@ -255,7 +256,17 @@ def build_tier3_context(file_items: list[dict], screenshot_base_dir: Path, scree
                 sections.append("### `" + (entry or path_str) + "`\n\n" + 
                                 f"```{path.suffix.lstrip('.') if path and path.suffix else 'text'}\n{item.get('content', '')}\n```")
             else:
-                sections.append(summarize.summarise_file(path, item.get("content", "")))
+                content = item.get("content", "")
+                if path and path.suffix == ".py" and not item.get("error"):
+                    try:
+                        parser = ASTParser("python")
+                        skeleton = parser.get_skeleton(content)
+                        sections.append(f"### `{entry or path_str}` (AST Skeleton)\n\n```python\n{skeleton}\n```")
+                    except Exception as e:
+                        # Fallback to summary if AST parsing fails
+                        sections.append(summarize.summarise_file(path, content))
+                else:
+                    sections.append(summarize.summarise_file(path, content))
                 
         parts.append("## Files (Tier 3 - Focused)\n\n" + "\n\n---\n\n".join(sections))