fix: clarify TypeError order dependency in error classifier

Address Greptile review: add comment noting that TypeError('fetch failed')
is already handled by transport patterns before the instanceof check.

src/cli/hook-command.ts

@@ -54,7 +54,6 @@ export function isWorkerUnavailableError(error: unknown): boolean {
   // HTTP 4xx client errors — our bug, NOT worker unavailability
   if (/failed:\s*4\d{2}/.test(message) || /status[:\s]+4\d{2}/.test(message)) return false;
 
-  // Programming errors — code bugs, not worker unavailability
   // Programming errors — code bugs, not worker unavailability
   // Note: TypeError('fetch failed') already handled by transport patterns above
   if (error instanceof TypeError || error instanceof ReferenceError || error instanceof SyntaxError) {