Refactor code structure for improved readability and maintainability

src/bin/hooks/cleanup-hook.ts

@@ -0,0 +1,20 @@
+#!/usr/bin/env bun
+
+/**
+ * Cleanup Hook Entry Point - SessionEnd
+ * Standalone executable for plugin hooks
+ */
+
+import { cleanupHook } from '../../hooks/cleanup.js';
+
+// Read input from stdin
+const input = await Bun.stdin.text();
+
+try {
+  const parsed = input.trim() ? JSON.parse(input) : undefined;
+  cleanupHook(parsed);
+} catch (error: any) {
+  console.error(`[claude-mem cleanup-hook error: ${error.message}]`);
+  console.log('{"continue": true, "suppressOutput": true}');
+  process.exit(0);
+}