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/web-shader-extractor/references/tech-signatures.md

@@ -0,0 +1,54 @@
+# 框架识别特征
+
+## Three.js
+
+**未混淆**：`THREE.`, `WebGLRenderer`, `ShaderMaterial`, `BufferGeometry`
+
+**混淆后**（通过构造参数推断）：
+
+| 调用模式 | 原始类 |
+|---------|--------|
+| `new X({canvas, antialias, alpha})` | `WebGLRenderer` |
+| `new X(fov, aspect, near, far)` — 4 数字 | `PerspectiveCamera` |
+| `new X(-1, 1, 1, -1, 0, 1)` — 6 参数 | `OrthographicCamera` |
+| `new X(w, h, {wrapS, minFilter})` | `WebGLRenderTarget` |
+| `new X(data, w, h, format, type)` — Float32Array | `DataTexture` |
+| `new X(2, 2)` 作为几何体 | `PlaneGeometry` |
+| `new X({uniforms, vertexShader, fragmentShader})` | `ShaderMaterial` |
+| `X.getElapsedTime()` | `Clock` |
+
+**常量**：`ClampToEdgeWrapping`, `NearestFilter`, `RGBAFormat`, `FloatType`, `DoubleSide`
+
+## 2D Canvas
+
+`dataEngine: null` 时，用 `getContext('2d')` 有无 + `createShader`/`shaderSource` 有无区分：
+- 有 `getContext('2d')`，无 WebGL 调用 → 纯 2D Canvas
+- 有 WebGL 调用 → Raw WebGL / PixiJS
+
+## Raw WebGL
+
+```javascript
+gl.createShader / gl.shaderSource / gl.compileShader / gl.createProgram
+gl.bindBuffer / gl.bindFramebuffer / gl.drawArrays
+```
+
+## PixiJS
+
+`PIXI.Application`, `PIXI.Filter`, `new PIXI.Filter(vertSrc, fragSrc, uniforms)`
+
+## Babylon.js
+
+`BABYLON.Engine`, `BABYLON.ShaderMaterial`, `BABYLON.Effect.ShadersStore`
+
+## GPGPU 模式
+
+两个 `WebGLRenderTarget`（ping-pong）+ `OrthographicCamera(-1,1,1,-1,0,1)` + `PlaneGeometry(2,2)` + `DataTexture` 初始位置 + `setRenderTarget` 循环
+
+## 常见噪声
+
+| 函数 | 类型 |
+|------|------|
+| `snoise` | Simplex noise (Ashima) |
+| `cnoise` | Classic Perlin |
+| `cellular` | Worley/Voronoi |
+| `fbm` | Fractal Brownian Motion |