EANCH-WP-0001 T02: bootstrap standalone TS package + test harness

Add package.json (name evidence-anchor, exports . and ./pdf, scripts
test/typecheck/lint), tsconfig.json (mirrors engine, DOM+jsx), vitest.config.ts
(happy-dom + react plugin), eslint.config.js (confines viewer libs to src/pdf/),
.nvmrc, and placeholder src entrypoints. Depends on @citation-evidence/engine
via sibling-checkout link only; no citation-evidence internals.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

package.json

@@ -0,0 +1,59 @@
+{
+  "name": "evidence-anchor",
+  "version": "0.1.0",
+  "private": true,
+  "description": "Selector creation, resolution, re-anchoring, and highlight/scroll contracts for the citation-evidence ecosystem.",
+  "license": "Apache-2.0",
+  "type": "module",
+  "packageManager": "pnpm@9.15.0",
+  "engines": {
+    "node": ">=20.10.0"
+  },
+  "files": [
+    "src",
+    "README.md",
+    "SCOPE.md",
+    "INTENT.md",
+    "LICENSE"
+  ],
+  "exports": {
+    ".": "./src/index.ts",
+    "./pdf": "./src/pdf/index.ts"
+  },
+  "scripts": {
+    "test": "vitest run",
+    "test:watch": "vitest",
+    "lint": "eslint .",
+    "typecheck": "tsc -b --noEmit"
+  },
+  "dependencies": {
+    "@citation-evidence/engine": "link:../citation-engine"
+  },
+  "peerDependencies": {
+    "pdfjs-dist": "^4.4.168",
+    "react": "^18.3.1",
+    "react-dom": "^18.3.1",
+    "react-pdf-highlighter-plus": "^1.1.4"
+  },
+  "devDependencies": {
+    "@testing-library/dom": "^10.4.1",
+    "@testing-library/react": "^16.3.2",
+    "@testing-library/user-event": "^14.6.1",
+    "@types/node": "^20.14.0",
+    "@types/react": "^18.3.3",
+    "@types/react-dom": "^18.3.0",
+    "@vitejs/plugin-react": "^4.3.1",
+    "eslint": "^9.7.0",
+    "eslint-import-resolver-typescript": "^3.6.3",
+    "eslint-plugin-import": "^2.30.0",
+    "globals": "^15.9.0",
+    "happy-dom": "^20.9.0",
+    "pdfjs-dist": "^4.4.168",
+    "react": "^18.3.1",
+    "react-dom": "^18.3.1",
+    "react-pdf-highlighter-plus": "^1.1.4",
+    "typescript": "^5.5.4",
+    "typescript-eslint": "^8.0.0",
+    "vitest": "^2.0.5"
+  }
+}