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/design/design-systems/style-skills/parchment/SKILL.md

@@ -0,0 +1,66 @@
+---
+name: parchment
+description: Warm editorial, print-leaning document design system — parchment background, single ink-blue accent, serif-led hierarchy (LXGW WenKai for Chinese, Charter for English). For résumés, reports, white papers, letters, and editorial reading pages that should feel authored and published. Not a product-UI / component system.
+license: MIT
+metadata:
+  author: adapted from Kami (tw93), OFL/MIT sources
+---
+
+# Parchment Design System Skill (Document / Editorial)
+
+## Mission
+You are a design-system guideline author for **Parchment**, a warm editorial system for formal and long-form documents. Produce guidance that makes a document read as authored and published, not generated.
+
+## Brand
+Parchment is a print-leaning editorial system: a calm parchment ground, one restrained ink-blue accent, and a serif-led hierarchy. It suits résumés, one-pagers, reports, white papers, letters, and editorial reading pages — documents meant to be read and printed (A4 / PDF), not dense interactive product UI.
+
+## Style Foundations
+- Visual style: editorial, formal, print-leaning, warm, content-first
+- Typography scale: 12/14/16/18/22/26/36 | Fonts: primary=LXGW WenKai Screen (CN), display=Charter (EN), mono=JetBrains Mono | weights=400, 500
+- Color palette: parchment surface #f5f4ed / ivory #faf9f5, ink tiers near-black #141413 / olive #504e49 / stone #6b6a64, single accent ink-blue #1B365D
+- Spacing scale: 6/12/16/24/32/48
+- Page: A4, ~14mm/16mm margins, real pagination, print-color-adjust: exact
+
+## Writing Tone
+calm, precise, editorial, professional, low-jargon
+
+## Rules: Do
+- keep a warm parchment ground; never pure white
+- lead with serif hierarchy (size / weight 500 / space), not boxes and cards
+- use the single ink-blue accent for rules, headers, emphasis — and nothing else
+- hold a controlled text measure; let margins and whitespace pace the reading
+- paginate for print (A4), with deliberate page breaks
+- give figures/tables captions and real or clearly-marked sample data
+- load the Chinese serif online via the @import in DESIGN.md
+
+## Rules: Don't
+- avoid a second accent color competing with the ink-blue
+- avoid web-y card grids, bento layouts, gradient meshes, neon, glows
+- avoid emoji as icons
+- avoid invented data, fake metrics, fake citations
+- avoid full-page-width body lines and edge-to-edge cramming
+- avoid synthetic bold; use weight 500 for emphasis
+
+## Expected Behavior
+- This is a document/editorial system: optimize for reading and print, not for interaction states.
+- When uncertain, prioritize legibility, hierarchy, and whitespace over decoration.
+- Keep one serif per page; one accent; warm ground.
+- It pairs naturally with the content-page scenario: content-page handles structure and reading rhythm, Parchment supplies the visual character.
+
+## Best For
+- résumés, one-pagers, formal letters
+- reports, white papers, long-form documents, equity/research reports
+- editorial reading pages, public-account long reads that want a printed, literary feel
+
+## Not For
+- product UI, dashboards, admin panels, data-dense interfaces (use a UI-oriented style)
+- marketing landing pages, loud commercial launches
+- anything where interaction/animation is the point
+
+## Quality Gates
+- parchment ground present; no pure-white page
+- exactly one accent (ink-blue); no competing color
+- serif hierarchy reads without relying on boxes
+- text measure controlled; whitespace deliberate
+- Chinese serif actually loaded (@import), with system-serif fallback
+- data is real or clearly marked sample