refactor(bootstrap/node): colocate downloadCli + isCliInstalled (drop unused exports)

Author: jdalton

packages/cli/src/bootstrap/node.mts

@@ -36,7 +36,7 @@ const logger = getDefaultLogger()
  * Download CLI using npm pack command. This delegates to npm which handles
  * downloading and extracting the latest version.
  */
-export async function downloadCli(): Promise<void> {
+async function downloadCli(): Promise<void> {
   const packageName = getCliPackageName()
   const dlxDir = getDlxDir()
   const cliDir = getCliPackageDir()
@@ -112,7 +112,7 @@ export async function downloadCli(): Promise<void> {
 /**
  * Check if CLI is installed.
  */
-export function isCliInstalled(): boolean {
+function isCliInstalled(): boolean {
   const entryPoint = getCliEntryPoint()
   const packageJson = `${getCliPackageDir()}/package.json`
   return existsSync(entryPoint) && existsSync(packageJson)