feat: Add cw account extract CLI command with tests

Adds `cw account extract [--email <email>]` subcommand to the accountCommand
group. Reads directly from the local Claude config via extractCurrentClaudeAccount()
without requiring a server connection. Supports optional email verification,
outputting JSON with email, configJson (stringified), and credentials fields.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/server/cli/index.ts

@@ -1334,6 +1334,32 @@ export function createCli(serverHandler?: (port?: number) => Promise<void>): Com
       }
     });
 
+  // cw account extract
+  accountCommand
+    .command('extract')
+    .description('Extract current Claude credentials for use with the UI (does not require server)')
+    .option('--email <email>', 'Verify extracted account matches this email')
+    .action(async (options: { email?: string }) => {
+      try {
+        const { extractCurrentClaudeAccount } = await import('../agent/accounts/index.js');
+        const extracted = await extractCurrentClaudeAccount();
+        if (options.email && extracted.email !== options.email) {
+          console.error(`Account '${options.email}' not found (active account is '${extracted.email}')`);
+          process.exit(1);
+          return;
+        }
+        const output = {
+          email: extracted.email,
+          configJson: JSON.stringify(extracted.configJson),
+          credentials: extracted.credentials,
+        };
+        console.log(JSON.stringify(output, null, 2));
+      } catch (error) {
+        console.error('Failed to extract account:', (error as Error).message);
+        process.exit(1);
+      }
+    });
+
   // Preview command group
   const previewCommand = program
     .command('preview')