docs: scaffold polisher-control foundation

host/polisher_control/data_layout.py

@@ -0,0 +1,17 @@
+from pathlib import Path
+
+
+def manual_session_dir(data_root: Path, session_id: str) -> Path:
+    return data_root / "manual" / session_id
+
+
+def run_dir(data_root: Path, run_id: str) -> Path:
+    return data_root / "runs" / run_id
+
+
+def expected_manual_files(session_id: str) -> list[str]:
+    return [
+        "manual-session-log.v1.json",
+        "telemetry.csv",
+        "manifest.json",
+    ]