chore(cli): acr update 下載/解壓進度提示（chalk gray）

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

cli/src/lib/deploy.ts

@@ -12,6 +12,7 @@ import { execFileSync } from 'node:child_process';
 import { mkdtempSync, readFileSync, writeFileSync, existsSync, readdirSync, statSync } from 'node:fs';
 import { tmpdir } from 'node:os';
 import { join } from 'node:path';
+import chalk from 'chalk';
 
 /** GitHub repo（codeload tarball 來源）。fork 者改這裡或用 ARCRUN_REPO env。
  *  注意：repo 名大小寫敏感（codeload 路徑需完全一致）。*/
@@ -185,10 +186,13 @@ async function applyD1Migration(ctx: DeployContext, sql: string): Promise<void>
 /** 下載 codeload tarball 解壓到暫存目錄，回傳解壓出的 repo root 路徑。*/
 async function downloadRepoTarball(ref: string): Promise<string> {
   const url = `https://codeload.github.com/${ARCRUN_REPO}/tar.gz/${ref}`;
+  console.log(chalk.gray(`  → 從 GitHub 下載最新版本（${ARCRUN_REPO}@${ref}，約 10–30 秒，視網速）...`));
   const res = await fetch(url, { signal: AbortSignal.timeout(120_000) });
   if (!res.ok) throw new Error(`codeload HTTP ${res.status}（${url}）`);
 
   const buf = Buffer.from(await res.arrayBuffer());
+  const sizeMB = (buf.length / 1024 / 1024).toFixed(1);
+  console.log(chalk.gray(`  → 下載完成（${sizeMB} MB），解壓中...`));
   const dir = mkdtempSync(join(tmpdir(), 'arcrun-deploy-'));
   const tarPath = join(dir, 'repo.tar.gz');
   writeFileSync(tarPath, buf);