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/contentanalysis/SKILL.md

@@ -0,0 +1,14 @@
+---
+name: ContentAnalysis
+description: Content extraction and analysis — wisdom extraction from videos, podcasts, articles, and YouTube. USE WHEN extract wisdom, content analysis, analyze content, insight report, analyze video, analyze podcast, extract insights, key takeaways, what did I miss, extract from YouTube.
+---
+
+# ContentAnalysis
+
+Unified skill for content extraction and analysis workflows.
+
+## Workflow Routing
+
+| Request Pattern | Route To |
+|---|---|
+| Extract wisdom, content analysis, insight report, analyze content | `ExtractWisdom/SKILL.md` |