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/deck.md

@@ -0,0 +1,105 @@
+---
+name: Deck Skill
+description: Design HTML-based slide decks, presentation decks, pitch decks, report decks, and narrative visual presentations.
+mode: deck
+platform: presentation
+scenario: deck
+preview:
+  type: html
+default_for:
+  - deck
+  - presentation
+  - slide deck
+  - pitch deck
+  - product deck
+  - report deck
+  - strategy deck
+  - workshop deck
+  - 演示文稿
+  - 路演材料
+speaker_notes: optional
+animations: optional
+fidelity: high
+---
+
+# Deck Skill
+
+Design a paged, one-screen-at-a-time presentation that carries a narrative — each slide makes
+one point, and the sequence builds an argument.
+
+Judgment, not a rulebook. Use taste. Techniques: `horizontal-craft/technique-library.md`; delivery
+check: `skills/design/quality-gate.md`. For a base runtime/template, see
+`skills/design/prototype-templates/` (html-ppt seed) and the Preset Template Rule in SKILL.md.
+
+## Route elsewhere if
+
+- it's a scrollable web page (not paged) → `landing-page.md` / `content-page.md`
+- it's an interactive product → `prototype.md`
+
+## What makes a deck succeed: one idea per slide, a story across slides
+
+The failure mode is text-dumped slides with no narrative spine — bullet walls that should have
+been a doc. So:
+
+- **One idea per slide.** Each slide has a single takeaway, stated clearly. If a slide needs two
+  points, it's two slides.
+- **A narrative arc.** The deck has a beginning (problem/context), middle (argument/evidence),
+  and end (ask/conclusion). Order the slides to build, not just enumerate.
+- **Show, don't dump.** Visualize relationships and data; a sentence + a strong visual beats a
+  paragraph. Speaker notes carry the detail, not the slide.
+
+## The few decisions that matter
+
+- **Deck type & tone** — pitch (persuasive, bold), report (clear, sober), strategy (structured),
+  workshop (interactive). This sets density, color, and pacing.
+- **Narrative spine** — the sequence of takeaways before any visuals. Get the story right first.
+- **Slide rhythm** — vary slide types (statement, data, comparison, quote, section break);
+  don't repeat the same layout 20 times. Use full-bleed moments for emphasis.
+- **Data honesty** — charts with correct axes/units/scales; the title states the insight; never
+  invent numbers.
+
+## Non-negotiables
+
+- One idea per slide; speaker-facing detail goes in notes, not on the slide.
+- Never invent data, quotes, or metrics; charts faithful to real numbers.
+- Consistent system (type scale, color, spacing) across all slides.
+- No decorative emoji as icons (use SVG); no Lorem ipsum.
+
+## Avoiding AI slop (one principle)
+
+Catalog in `quality-gate.md`. Principle: each slide's layout serves its specific point, not a
+repeated template. A title + three bullets on every slide, a generic gradient title slide,
+identical icon-feature rows — reflexes. Vary with intent; when a slide feels like filler, cut it.
+
+## Workflow
+
+1. Define the deck type, audience, and the single ask/conclusion.
+2. Write the narrative spine (the ordered takeaways) before designing slides.
+3. Design slides — one idea each, varied rhythm, visuals over text; detail to speaker notes.
+4. Techniques/animations from `horizontal-craft/technique-library.md` only when they aid the point; reduced-motion.
+5. Quality gate before delivery; verify data honesty and one-idea-per-slide.
+
+## References (load only when relevant)
+
+- `horizontal-craft/chinese-typography.md` — substantial Chinese text (Mandatory Runtime Baseline).
+- `horizontal-craft/icon-system.md` — when icons are used.
+- `canvas-and-device.md` — slide dimensions / export sizes.
+- `design-system-reference.md` — when a brand/style/template reference is given (see SKILL.md Style Routing).
+- `horizontal-craft/technique-library.md` — restrained transitions only when they aid the narrative.
+
+## Creative Context
+
+For open-ended requests, complete `SKILL.md` Creative Context (creative_positioning,
+first_impression, anti_default) before generating.
+
+## Mandatory Final Gate
+
+Run `quality-gate.md` as a blocking check. Must satisfy: one idea per slide; honest data/charts;
+consistent system across slides; no invented numbers/quotes; no emoji-as-icons / Lorem ipsum;
+visible focus and reduced-motion where interactive; non-visible Design Compliance block matching
+the code. Apply `horizontal-craft/chinese-typography.md` if substantial Chinese text.
+
+## Handoff
+
+May continue to: `design-system-reference.md`, `design-system-generation.md`, `export.md`,
+`skills/version-management/SKILL.md`, built-in selected-region edits, and local parameter handling.