chore: start transition layout — python into version-python/, scaffold version-rust/

- git mv of all existing files into version-python/ (history preserved)
- version-rust/: minimal cargo scaffold (edition 2024), no deps yet
- root AGENTS.md documents the transition rules and artifact/schema contract
- main is untouched; the python layout there stays as-is

version-python/tools/gw_browse_test.py

@@ -0,0 +1,21 @@
+#!/usr/bin/env python3
+"""One-shot browse of the GW Algolia index -> gwshop_raw.json (gitignored)."""
+import json
+import logging
+import pathlib
+import sys
+
+sys.path.insert(0, str(pathlib.Path(__file__).resolve().parent.parent))
+
+import dlphelper.gwshop as gw
+
+logging.basicConfig(level=logging.INFO, format="%(levelname)s %(message)s")
+
+app, key = gw.load_credentials()
+client = gw.GwShopClient(app, key)
+hits = client.browse("prod-lazarus-product-en-ww", hits_per_page=100)
+print("total hits", len(hits))
+pathlib.Path("gwshop_raw.json").write_text(
+    json.dumps(hits, ensure_ascii=False), encoding="utf-8"
+)
+print("written gwshop_raw.json")