feat(contracts): UniversalRow 契约 v1 冻结 + 守卫 + 测试

Co-Authored-By: Claude Code <noreply@anthropic.com>

packages/contracts/package.json

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+{
+  "name": "@sf/contracts",
+  "version": "0.1.0",
+  "description": "SiteForge 跨源契约：UniversalRow 统一中间格式（契约冻结，变更须升版）",
+  "type": "module",
+  "main": "./dist/src/index.js",
+  "types": "./dist/src/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/src/index.d.ts",
+      "default": "./dist/src/index.js"
+    }
+  },
+  "scripts": {
+    "build": "tsc -p tsconfig.json",
+    "test": "vitest run"
+  }
+}

packages/contracts/src/index.ts

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+export * from './universal-row.js'

packages/contracts/src/universal-row.ts

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+export const UNIVERSAL_ROW_VERSION = 1
+
+export interface UniversalRow {
+  sourceType: string
+  sourceId: string
+  status: string
+  locale: string
+  sourceUrl?: string
+  slug?: string
+  title?: string
+  excerpt?: string
+  bodyHtml?: string
+  publishedAt?: string
+  modifiedAt?: string
+  taxonomyRefs: Array<{ taxonomy: string; sourceTermId: string }>
+  attachmentRefs: Array<{ role: string; sourceId?: string; sourceUrl?: string }>
+  seo: Record<string, unknown>
+  knownFields: Record<string, unknown>
+  extras: Record<string, unknown>
+  rawLocation: string
+}
+
+const REQUIRED: (keyof UniversalRow)[] = [
+  'sourceType', 'sourceId', 'status', 'locale',
+  'taxonomyRefs', 'attachmentRefs', 'seo', 'knownFields', 'extras', 'rawLocation',
+]
+
+export function isUniversalRow(v: unknown): v is UniversalRow {
+  if (typeof v !== 'object' || v === null) return false
+  const row = v as Record<string, unknown>
+  return REQUIRED.every((k) => k in row)
+    && Array.isArray(row.taxonomyRefs) && Array.isArray(row.attachmentRefs)
+    && row.seo !== null && typeof row.seo === 'object'
+    && row.knownFields !== null && typeof row.knownFields === 'object'
+    && row.extras !== null && typeof row.extras === 'object'
+}

packages/contracts/test/universal-row.test.ts

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+import { describe, it, expect } from 'vitest'
+import { UNIVERSAL_ROW_VERSION, isUniversalRow, type UniversalRow } from '../src/index.js'
+
+const valid: UniversalRow = {
+  sourceType: 'wp:post', sourceId: '101', status: 'publish', locale: 'en',
+  sourceUrl: 'https://fixture.example/news/fixture-news-a.html',
+  slug: 'fixture-news-a', title: 'Fixture News A', excerpt: 'Fixture excerpt A',
+  bodyHtml: '<p>Body</p>', publishedAt: '2026-10-05T09:00:00Z', modifiedAt: '2026-10-06T10:00:00Z',
+  taxonomyRefs: [{ taxonomy: 'category', sourceTermId: '31' }],
+  attachmentRefs: [{ role: 'featured', sourceId: '201' }],
+  seo: { title: 'Fixture SEO Title A' },
+  knownFields: {}, extras: { custom_meta: 'x' },
+  rawLocation: 'wxr://item/3',
+}
+
+describe('UniversalRow 契约', () => {
+  it('版本号为 1（冻结，变更须升版并保留转换测试）', () => {
+    expect(UNIVERSAL_ROW_VERSION).toBe(1)
+  })
+  it('合法对象通过守卫', () => {
+    expect(isUniversalRow(valid)).toBe(true)
+  })
+  it('缺必填字段拒绝', () => {
+    const { sourceId: _omit, ...bad } = valid
+    expect(isUniversalRow(bad)).toBe(false)
+  })
+})

packages/contracts/tsconfig.json

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+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "dist"
+  },
+  "include": ["src", "test"]
+}