feat: Slack alerts for chat widget escalations + support@ email polling

- notifications/slack.ts: added sendChatEscalationAlert (fires when visitor
  asks about pricing, demo, help, or a human) and sendSupportEmailAlert
- email-poller.ts: polls support@squaremcp.com every 5 min via IMAP,
  deduplicates with Redis (support📧alerted_uids), fires Slack alert
  for each new unseen message
- index.ts: detectEscalation() scans last user message for trigger phrases;
  chat endpoint fires alert fire-and-forget after responding; startEmailPoller()
  called on server boot

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

src/index.ts

@@ -37,6 +37,8 @@ import { deliverWebhook, isValidWebhookUrl } from './webhooks/delivery.js';
 import { notifyNewPilotRequest } from './notifications/index.js';
 import redis from './redis.js';
 import { handleChat, type ChatMessage } from './chat.js';
+import { startEmailPoller } from './email-poller.js';
+import { sendChatEscalationAlert } from './notifications/slack.js';
 
 process.on('uncaughtException', (err) => {
   console.error('FATAL uncaughtException:', err);
@@ -1997,6 +1999,24 @@ app.post('/api/facebook/video', requireAuth, async (req, res) => {
 });
 
 // ── Chat widget endpoint ────────────────────────────────────────
+const ESCALATION_PATTERNS = [
+  /\b(human|person|agent|someone|anybody|real person)\b/i,
+  /\bspeak\s+to\b|\btalk\s+to\b|\bcontact\s+(you|someone|support|sales)\b/i,
+  /\b(pricing|price|cost|how much|plans?|subscribe|sign\s*up|get\s+started|trial|demo)\b/i,
+  /\b(help me|need help|can you help|support)\b/i,
+  /\bemail\s+(you|garfield|support|sales)\b/i,
+];
+
+function detectEscalation(messages: ChatMessage[]): string | null {
+  const lastUser = [...messages].reverse().find(m => m.role === 'user');
+  if (!lastUser) return null;
+  for (const pattern of ESCALATION_PATTERNS) {
+    const match = lastUser.content.match(pattern);
+    if (match) return match[0];
+  }
+  return null;
+}
+
 app.post('/api/chat', async (req, res) => {
   const { messages } = req.body as { messages?: ChatMessage[] };
   if (!Array.isArray(messages) || messages.length === 0) {
@@ -2006,6 +2026,15 @@ app.post('/api/chat', async (req, res) => {
   try {
     const { reply, toolsUsed } = await handleChat(messages);
     res.json({ reply, toolsUsed });
+
+    const trigger = detectEscalation(messages);
+    if (trigger) {
+      sendChatEscalationAlert({
+        trigger,
+        conversation: messages,
+        userAgent: (req as { get: (h: string) => string | undefined }).get('user-agent'),
+      }).catch(err => console.error('[chat] escalation alert error:', err));
+    }
   } catch (err) {
     console.error('[chat] error:', (err as Error).message);
     res.status(500).json({ error: 'Chat unavailable' });
@@ -2153,6 +2182,8 @@ async function main() {
     ]);
   }
 
+  startEmailPoller();
+
   app.listen(PORT, () => {
     console.log(`Hermes MCP server running on port ${PORT}`);
     console.log(`  Streamable HTTP: ${SERVER_URL}/mcp`);