Complete 3axis tutorial native and Web/WASM parity tools

scripts/test_axis3_tutorial_preview.py

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+#!/usr/bin/env python3
+"""Verify Web preview geometry is produced by the WASM worker."""
+
+from __future__ import annotations
+
+import json
+import subprocess
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[1]
+PROGRAM = ROOT / "linuxcnc/nc_files/3dtest.ngc"
+
+
+def main() -> int:
+    result = subprocess.run(["node", "web/worker/test_wasm_preview.mjs"], cwd=ROOT, text=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, check=False)
+    if result.returncode != 0:
+        print(result.stderr, end="")
+        return result.returncode
+    report = json.loads(result.stdout.strip().splitlines()[-1])
+    print(json.dumps({"status": "verified", "program": PROGRAM.as_posix(), "preview": report}, ensure_ascii=False))
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())