feat: IMAP mail sync with thread-to-contact matching (PRD §6.1)

Real IMAP connection via imapflow library:
- Connects to IMAP server (IMAPFlow, TLS on port 993)
- Fetches recent messages (configurable limit, default 20)
- Extracts: from, fromEmail, subject, date, snippet (200 chars)
- Thread-to-contact matching (PRD §6.1):
  1. Match sender email against persons table
  2. If no person match, extract domain and match against company.website
  3. Returns matchedCompany + matchedPerson for each email
- Audit-logged (action: crm.mailsync:imap)
- Zod validated (host, port, user, password, folder, limit)
- 502 on IMAP connection failure with detail
- 400 on validation failure

Tested: invalid creds → 502 'IMAP connection failed', missing host → 400

skills/LLM/scripts/chat.ts

@@ -0,0 +1,32 @@
+import ZAI, { ChatMessage } from "z-ai-web-dev-sdk";
+
+async function main(prompt: string) {
+  try {
+    const zai = await ZAI.create();
+
+    const messages: ChatMessage[] = [
+      {
+        role: "assistant",
+        content: "Hi, I'm a helpful assistant."
+      },
+      {
+        role: "user",
+        content: prompt,
+      },
+    ];
+
+    const response = await zai.chat.completions.create({
+      messages,
+      stream: false,
+      thinking: { type: "disabled" },
+    });
+
+    const reply = response.choices?.[0]?.message?.content;
+    console.log("Chat reply:");
+    console.log(reply ?? JSON.stringify(response, null, 2));
+  } catch (err: any) {
+    console.error("Chat failed:", err?.message || err);
+  }
+}
+
+main('What is the capital of France?');