test(skill): add bb mail lifecycle and preflight coverage

tests/skills/beadboard-driver/ensure-bb-mail-configured.test.ts

@@ -0,0 +1,35 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import fs from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+import { execFile } from 'node:child_process';
+import { promisify } from 'node:util';
+
+const execFileAsync = promisify(execFile);
+const scriptPath = path.resolve('skills/beadboard-driver/scripts/ensure-bb-mail-configured.mjs');
+
+async function withTempDir(run: (root: string) => Promise<void>) {
+  const root = await fs.mkdtemp(path.join(os.tmpdir(), 'bb-skill-mailcfg-ts-'));
+  try {
+    await run(root);
+  } finally {
+    await fs.rm(root, { recursive: true, force: true });
+  }
+}
+
+test('ensure-bb-mail-configured reports missing delegate outside initialized repo', async () => {
+  await withTempDir(async (root) => {
+    const { stdout } = await execFileAsync(process.execPath, [scriptPath], {
+      cwd: root,
+      env: {
+        ...process.env,
+        BB_AGENT: 'test-agent',
+      },
+    });
+
+    const result = JSON.parse(stdout);
+    assert.equal(result.ok, false);
+    assert.equal(result.error_code, 'MAIL_DELEGATE_MISSING');
+  });
+});