fix: resolve all test failures and Cubic review issues

- Fix unstable-agent-babysitter: add promptAsync to test mock
- Fix claude-code-mcp-loader: isolate tests from user home configs
- Fix npm-dist-tags: encode packageName for scoped packages
- Fix agent-builder: clone source to prevent shared object mutation
- Fix add-plugin-to-opencode-config: handle JSONC with leading comments
- Fix auth-plugins/add-provider-config: error on parse failures
- Fix bun-install: clear timeout on completion
- Fix git-diff-stats: include untracked files in diff summary

src/cli/config-manager/bun-install.ts

@@ -22,11 +22,13 @@ export async function runBunInstallWithDetails(): Promise<BunInstallResult> {
       stderr: "pipe",
     })
 
-    const timeoutPromise = new Promise<"timeout">((resolve) =>
-      setTimeout(() => resolve("timeout"), BUN_INSTALL_TIMEOUT_MS)
-    )
+    let timeoutId: ReturnType<typeof setTimeout>
+    const timeoutPromise = new Promise<"timeout">((resolve) => {
+      timeoutId = setTimeout(() => resolve("timeout"), BUN_INSTALL_TIMEOUT_MS)
+    })
     const exitPromise = proc.exited.then(() => "completed" as const)
     const result = await Promise.race([exitPromise, timeoutPromise])
+    clearTimeout(timeoutId!)
 
     if (result === "timeout") {
       try {