chore(01.1-01): install and configure Vitest test framework

- Add vitest as dev dependency
- Create vitest.config.ts with globals, TypeScript support, coverage
- Add npm scripts: test, test:watch, test:coverage

package.json

@@ -10,7 +10,10 @@
   "scripts": {
     "build": "tsc",
     "dev": "tsx watch src/bin/cw.ts",
-    "clean": "rimraf dist"
+    "clean": "rimraf dist",
+    "test": "vitest run",
+    "test:watch": "vitest",
+    "test:coverage": "vitest run --coverage"
   },
   "keywords": [
     "claude",
@@ -21,13 +24,17 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
+    "@trpc/server": "^11.9.0",
     "commander": "^12.1.0",
-    "execa": "^9.5.2"
+    "execa": "^9.5.2",
+    "zod": "^4.3.6"
   },
   "devDependencies": {
+    "@trpc/client": "^11.9.0",
     "@types/node": "^22.10.7",
     "rimraf": "^6.0.1",
     "tsx": "^4.19.2",
-    "typescript": "^5.7.3"
+    "typescript": "^5.7.3",
+    "vitest": "^4.0.18"
   }
 }