fix: address second PR review — clean replace, IDE failure bubbling, bun validation

- cpSync now does rmSync before copy to avoid stale file merges
- setupIDEs() returns failed IDE list; install reports partial success
- runSmartInstall() returns boolean status instead of void
- Worker port in next-steps URL reads CLAUDE_MEM_WORKER_PORT env var
- Goose YAML regex stops at column-0 keys (prevents eating sibling sections)
- AGENTS.md uninstall removes header-only stub files
- findBunPath() validated before use in WindsurfHooksInstaller
- Cursor marked unsupported in ide-detection until installer is wired

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

scripts/build-hooks.js

@@ -244,7 +244,7 @@ async function buildHooks() {
       console.log(`✓ openclaw plugin built (${(openclawStats.size / 1024).toFixed(2)} KB)`);
     }
 
-    // Build OpenCode plugin (self-contained, runs in Bun)
+    // Build OpenCode plugin (self-contained, Node.js ESM — Bun-compatible)
     if (fs.existsSync('src/integrations/opencode-plugin/index.ts')) {
       console.log(`\n🔧 Building OpenCode plugin...`);
       const opencodeOutDir = 'dist/opencode-plugin';