feat(notifications): Slack alerts for new pilot requests

- Add src/notifications/slack.ts — Slack webhook integration with rich blocks
- Add src/notifications/index.ts — dispatcher with test-submission filtering
- Wire notifyNewPilotRequest() into POST /api/pilot-request (fire-and-forget)
- Filter out test submissions (@example.com, E2E, Smoke Test, QA Test, Browser Test)
- Skip alert gracefully when SLACK_PILOT_WEBHOOK_URL is not set
- Update .gitignore to exclude .playwright-mcp/ artifacts

src/index.ts

@@ -34,6 +34,7 @@ import { recordUsage, getMonthlyUsage, getUsageBreakdown, checkLimit } from './b
 import { getCustomerInvoices, getInvoiceByNumber, markInvoiceSent, markInvoicePaid, generateMonthlyInvoice } from './billing/invoices.js';
 import { getAllPlatformHealth } from './multitenancy/platform-health.js';
 import { deliverWebhook, isValidWebhookUrl } from './webhooks/delivery.js';
+import { notifyNewPilotRequest } from './notifications/index.js';
 import redis from './redis.js';
 
 const app = express();
@@ -2041,6 +2042,10 @@ app.post('/api/pilot-request', async (req, res) => {
 
   try {
     await appendPilotRequestToVault(requestId, body, req);
+    // Fire-and-forget notification — don't block response
+    notifyNewPilotRequest(body, requestId, req).catch((err) =>
+      console.error(`[notification] requestId=${requestId} error:`, err)
+    );
     res.status(201).json({ ok: true, request_id: requestId });
   } catch (error) {
     console.error(`[squaremcp] pilot_request ERROR requestId=${requestId}:`, error);