fix(build): register not_configured_handler in TOP_LEVEL_MODULES

The wheel-build drift gate caught the new module added in this PR —
without registering it, the published wheel would ship `import
not_configured_handler` un-rewritten, which would `ModuleNotFoundError`
at runtime under `molecule_runtime.main`.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scripts/build_runtime_package.py

@@ -73,6 +73,7 @@ TOP_LEVEL_MODULES = {
     "main",
     "mcp_cli",
     "molecule_ai_status",
+    "not_configured_handler",
     "platform_auth",
     "platform_inbound_auth",
     "plugins",