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/coding-agent/state.md

@@ -0,0 +1,60 @@
+# State Tracking Guidance
+
+Reference for tracking multiple tasks or requests.
+
+## Request Tracking
+
+Label each user request:
+```
+[R1] Build login page
+[R2] Add dark mode
+[R3] Fix header alignment
+```
+
+Track state for user visibility:
+```
+[R1] [DONE] Done
+[R2] [WIP] In progress (awaiting user approval for step 2)
+[R3] [Q] Queued
+```
+
+## Managing Multiple Requests
+
+When user sends a new request while another is in progress:
+
+1. Acknowledge: "Got it, I'll add this to the queue"
+2. Show updated queue to user
+3. Ask user if priority should change
+
+## Handling Interruptions
+
+| Situation | Suggested Action |
+|-----------|------------------|
+| New unrelated request | Add to queue, ask user priority |
+| Request affects current work | Pause, explain impact, ask user how to proceed |
+| User says "stop" or "wait" | Stop immediately, await instructions |
+| User changes requirements | Summarize impact, ask user to confirm changes |
+
+## User Decisions
+
+Always ask user before:
+- Starting work on queued items
+- Changing priority order
+- Rolling back completed work
+- Modifying the plan
+
+## Progress File (Optional)
+
+User may request a state file:
+```markdown
+## In Progress
+[R2] Dark mode - Step 2/4 (awaiting user approval)
+
+## Queued  
+[R3] Header fix
+
+## Done
+[R1] Login page [DONE]
+```
+
+Update only when user requests or approves changes.