refactor(sdm): Global pass with refined 'External Only' SDM tags. Pruned redundant internal references and fixed indentation logic in injector. Verified full project compilation.

src/outline_tool.py

@@ -54,6 +54,9 @@ class CodeOutliner:
    return None
 
   def walk(node: ast.AST, indent: int = 0) -> None:
+   """
+   [C: src/summarize.py:_summarise_python]
+   """
    if isinstance(node, ast.ClassDef):
     start_line = node.lineno
     end_line = getattr(node, "end_lineno", start_line)
@@ -87,4 +90,3 @@ def get_outline(path: Path, code: str) -> str:
   return outliner.outline(code)
  else:
   return f"Outlining not supported for {suffix} files yet."
-