Add HyperFrames skills

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011h6NB8JQtfPc6eRCefEzBB

.agents/skills/hyperframes-audio/scripts/lib/main-module.mjs

@@ -0,0 +1,13 @@
+import { realpathSync } from "node:fs";
+import { pathToFileURL } from "node:url";
+
+// Node resolves symlinks in the main module's import.meta.url but argv[1] keeps the invoked
+// spelling (a symlinked skills dir, or /tmp vs /private/tmp on macOS), so compare real paths.
+export function isMainModule(importMetaUrl) {
+  if (!process.argv[1]) return false;
+  try {
+    return pathToFileURL(realpathSync(process.argv[1])).href === importMetaUrl;
+  } catch {
+    return false;
+  }
+}