[WCTAS-2] Initialize npm/TypeScript project

Add package.json with build/start/dev/test scripts, tsconfig.json with
strict mode and CommonJS target, .gitignore, and CLAUDE.md documenting
the new project structure and commands.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

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+node_modules/
+dist/
+.env
+.env.local
+*.log
+npm-debug.log*
+.DS_Store
+.vscode/
+.idea/
+*.js.map
+coverage/

CLAUDE.md

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+# word-counter-api
+
+## Project Status
+
+Node.js/TypeScript project initialized with npm and tsconfig. Source code implementation is pending.
+
+## Build Commands
+
+```bash
+npm install        # install dependencies
+npm run build      # compile TypeScript → dist/ via tsc
+```
+
+## Test Commands
+
+```bash
+npm test                          # run full Jest test suite
+npm test -- path/to/file.test.ts  # run a single test file
+npm test -- -t "test name"        # run a single named test
+```
+
+## Development Commands
+
+```bash
+npm run dev    # tsx watch src/server.ts (TypeScript watch mode)
+npm start      # node dist/server.js (production build)
+```
+
+## Project Structure
+
+```
+word-counter-api/
+├── src/              # TypeScript source files (to be added)
+│   └── server.ts     # Entry point
+├── dist/             # Compiled JavaScript output (gitignored)
+├── package.json      # npm manifest with build/start/dev/test scripts
+├── tsconfig.json     # TypeScript config (CommonJS, strict mode)
+├── .gitignore
+├── README.md
+└── CLAUDE.md         # This file
+```
+
+## Architecture Notes
+
+- **Purpose**: An API service for counting words in text input.
+- **Stack**: Node.js + TypeScript (CommonJS modules, `tsc` build, `tsx` for dev watch).
+- Key design decisions still to make: HTTP framework, authentication strategy, request/response format (REST vs. GraphQL), deployment target.
+
+## Code Style
+
+TypeScript strict mode is enabled (`"strict": true` in tsconfig.json). No linter or formatter configured yet. Document here once a stack is chosen (e.g., ESLint/Prettier).

package.json

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+{
+  "name": "word-counter-api",
+  "version": "1.0.0",
+  "description": "HTTP API that counts words in text input",
+  "main": "dist/server.js",
+  "scripts": {
+    "build": "tsc",
+    "start": "node dist/server.js",
+    "dev": "tsx watch src/server.ts",
+    "test": "jest"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "@types/node": "^22.0.0",
+    "tsx": "^4.0.0",
+    "typescript": "^5.0.0"
+  }
+}

tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "module": "CommonJS",
+    "moduleResolution": "node",
+    "outDir": "dist",
+    "rootDir": "src",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "declaration": true,
+    "declarationMap": true,
+    "sourceMap": true
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist"]
+}