docs: scaffold polisher-control foundation

scripts/print_tree.py

@@ -0,0 +1,11 @@
+#!/usr/bin/env python3
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+for path in sorted(ROOT.rglob("*")):
+    if ".git" in path.parts or "__pycache__" in path.parts:
+        continue
+    rel = path.relative_to(ROOT)
+    if len(rel.parts) > 4:
+        continue
+    print(rel)