Add empty test level and Unreal MCP tooling

- L_TestFlight: empty, zero-gravity level for Phase 0 flight testing,
  set as editor/game default map.
- Enable UnrealMCPython + Python Editor Script Plugin, third-party
  MCP plugin (GenOrca/unreal-mcp v2.2.0) giving direct editor control
  (actors, blueprints, levels, materials, etc.) alongside Epic's
  built-in Unreal MCP plugin.
- Vendor the mcp-server Python source used to bridge to the plugin.
- .mcp.json intentionally gitignored (machine-specific absolute paths).

mcp-server/validate_tools.py

@@ -0,0 +1,39 @@
+#!/usr/bin/env python3
+# Copyright (c) 2025 GenOrca. All Rights Reserved.
+
+"""
+Validates that the dispatcher action catalog is in sync with the plugin's
+ue_* function signatures.
+
+The catalog (dispatchers/_catalog.py) is auto-generated by generate_catalog.py.
+This script re-runs the generator in --check mode: if the committed catalog
+differs from what the current signatures would produce, it fails.
+
+This catches the bug class where catalog param names drift from the real
+ue_* signatures (the dispatcher passes params straight through as
+ue_func(**params), so a name mismatch = runtime failure).
+
+Usage:
+    python validate_tools.py
+"""
+
+import subprocess
+import sys
+from pathlib import Path
+
+GENERATOR = Path(__file__).parent / "generate_catalog.py"
+
+
+def main():
+    result = subprocess.run(
+        [sys.executable, str(GENERATOR), "--check"],
+        capture_output=True,
+        text=True,
+    )
+    sys.stdout.write(result.stdout)
+    sys.stderr.write(result.stderr)
+    sys.exit(result.returncode)
+
+
+if __name__ == "__main__":
+    main()