fix(comment-checker): defer CLI download and cleanup scheduler to first tool call

src/hooks/comment-checker/initialization-gate.ts

@@ -0,0 +1,7 @@
+let initialized = false
+
+export function ensureCommentCheckerInitialization(initializer: () => void): void {
+  if (initialized) return
+  initialized = true
+  initializer()
+}