chore: add changeset for runtime safety checks

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Co-Authored-By: Claude <noreply@anthropic.com>

Author: ScriptedAlchemy

.changeset/runtime-safety-checks.md

@@ -0,0 +1,11 @@
+---
+"@module-federation/enhanced": patch
+---
+
+fix(enhanced): add runtime safety checks to prevent errors
+
+- Add typeof check for oldStartup function in EmbedFederationRuntimeModule to prevent calling undefined function
+- Add typeof check for __webpack_require__.x in StartupHelpers to prevent calling undefined function
+- Add warning logs when these functions are missing to help developers debug issues
+
+These defensive checks improve stability and prevent edge case failures in certain build configurations.