feat: add /diff command and git diff statistics utility

packages/cli/src/i18n/locales/en.js

@@ -153,6 +153,29 @@ export default {
     'Configure authentication information for login',
   'Copy the last result or code snippet to clipboard':
     'Copy the last result or code snippet to clipboard',
+  'Show working-tree change stats versus HEAD':
+    'Show working-tree change stats versus HEAD',
+  'Could not determine current working directory.':
+    'Could not determine current working directory.',
+  'Failed to compute git diff stats': 'Failed to compute git diff stats',
+  'No diff available. Either this is not a git repository, HEAD is missing, or a merge/rebase/cherry-pick/revert is in progress.':
+    'No diff available. Either this is not a git repository, HEAD is missing, or a merge/rebase/cherry-pick/revert is in progress.',
+  'Clean working tree — no changes against HEAD.':
+    'Clean working tree — no changes against HEAD.',
+  '{{count}} file changed, +{{added}} / -{{removed}}':
+    '{{count}} file changed, +{{added}} / -{{removed}}',
+  '{{count}} files changed, +{{added}} / -{{removed}}':
+    '{{count}} files changed, +{{added}} / -{{removed}}',
+  '{{count}} file changed': '{{count}} file changed',
+  '{{count}} files changed': '{{count}} files changed',
+  '…and {{hidden}} more (showing first {{shown}})':
+    '…and {{hidden}} more (showing first {{shown}})',
+  '(binary)': '(binary)',
+  '(binary, new)': '(binary, new)',
+  '(new)': '(new)',
+  '(new, partial)': '(new, partial)',
+  '(deleted)': '(deleted)',
+  '(binary, deleted)': '(binary, deleted)',
 
   // ============================================================================
   // Commands - Agents

packages/cli/src/i18n/locales/zh-TW.js

@@ -136,6 +136,28 @@ export default {
   'Configure authentication information for login': '配置登錄認證信息',
   'Copy the last result or code snippet to clipboard':
     '將最後的結果或代碼片段複製到剪貼板',
+  'Show working-tree change stats versus HEAD':
+    '顯示工作區相對 HEAD 的變更統計',
+  'Could not determine current working directory.': '無法確定當前工作目錄。',
+  'Failed to compute git diff stats': '計算 git diff 統計失敗',
+  'No diff available. Either this is not a git repository, HEAD is missing, or a merge/rebase/cherry-pick/revert is in progress.':
+    '無可用 diff。可能不是 Git 倉庫、HEAD 缺失，或正在執行 merge/rebase/cherry-pick/revert。',
+  'Clean working tree — no changes against HEAD.':
+    '工作區乾淨 —— 與 HEAD 無差異。',
+  '{{count}} file changed, +{{added}} / -{{removed}}':
+    '{{count}} 個檔案變更，+{{added}} / -{{removed}}',
+  '{{count}} files changed, +{{added}} / -{{removed}}':
+    '{{count}} 個檔案變更，+{{added}} / -{{removed}}',
+  '{{count}} file changed': '{{count}} 個檔案變更',
+  '{{count}} files changed': '{{count}} 個檔案變更',
+  '…and {{hidden}} more (showing first {{shown}})':
+    '…還有 {{hidden}} 個（僅顯示前 {{shown}} 個）',
+  '(binary)': '（二進位）',
+  '(binary, new)': '（二進位，新增）',
+  '(new)': '（新增）',
+  '(new, partial)': '（新增，部分統計）',
+  '(deleted)': '（已刪除）',
+  '(binary, deleted)': '（二進位，已刪除）',
   'Manage subagents for specialized task delegation.':
     '管理用於專門任務委派的子智能體',
   'Manage existing subagents (view, edit, delete).':

packages/cli/src/i18n/locales/zh.js

@@ -149,6 +149,28 @@ export default {
   'Configure authentication information for login': '配置登录认证信息',
   'Copy the last result or code snippet to clipboard':
     '将最后的结果或代码片段复制到剪贴板',
+  'Show working-tree change stats versus HEAD':
+    '显示工作区相对 HEAD 的变更统计',
+  'Could not determine current working directory.': '无法确定当前工作目录。',
+  'Failed to compute git diff stats': '计算 git diff 统计失败',
+  'No diff available. Either this is not a git repository, HEAD is missing, or a merge/rebase/cherry-pick/revert is in progress.':
+    '无可用 diff。可能不是 Git 仓库、HEAD 缺失，或正在执行 merge/rebase/cherry-pick/revert。',
+  'Clean working tree — no changes against HEAD.':
+    '工作区干净 —— 与 HEAD 无差异。',
+  '{{count}} file changed, +{{added}} / -{{removed}}':
+    '{{count}} 个文件变更，+{{added}} / -{{removed}}',
+  '{{count}} files changed, +{{added}} / -{{removed}}':
+    '{{count}} 个文件变更，+{{added}} / -{{removed}}',
+  '{{count}} file changed': '{{count}} 个文件变更',
+  '{{count}} files changed': '{{count}} 个文件变更',
+  '…and {{hidden}} more (showing first {{shown}})':
+    '…还有 {{hidden}} 个（仅显示前 {{shown}} 个）',
+  '(binary)': '（二进制）',
+  '(binary, new)': '（二进制，新增）',
+  '(new)': '（新增）',
+  '(new, partial)': '（新增，部分统计）',
+  '(deleted)': '（已删除）',
+  '(binary, deleted)': '（二进制，已删除）',
 
   // ============================================================================
   // Commands - Agents

packages/cli/src/services/BuiltinCommandLoader.ts

@@ -22,6 +22,7 @@ import { contextCommand } from '../ui/commands/contextCommand.js';
 import { copyCommand } from '../ui/commands/copyCommand.js';
 import { docsCommand } from '../ui/commands/docsCommand.js';
 import { doctorCommand } from '../ui/commands/doctorCommand.js';
+import { diffCommand } from '../ui/commands/diffCommand.js';
 import { directoryCommand } from '../ui/commands/directoryCommand.js';
 import { editorCommand } from '../ui/commands/editorCommand.js';
 import { exportCommand } from '../ui/commands/exportCommand.js';
@@ -103,6 +104,7 @@ export class BuiltinCommandLoader implements ICommandLoader {
       compressCommand,
       contextCommand,
       copyCommand,
+      diffCommand,
       deleteCommand,
       docsCommand,
       doctorCommand,