feat: add Todo API example project for Cloudflare Workers

Complete reference implementation demonstrating Nerva's Cloudflare Workers
deployment path with CRUD endpoints, D1 database, Zod validation, and
integration tests (15/15 passing).

- Hono REST API with middleware (CORS, security headers, request ID, ETag)
- Drizzle ORM with D1 (SQLite) schema and migration
- Zod request validation via @hono/zod-validator
- Vitest integration tests using Miniflare for real D1
- TypeScript strict mode with full Cloudflare Workers types
- README with setup, API docs, and deployment instructions
- Link added to main README Quick Start section

Closes #18

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Paul Mulligan

.lychee.toml

@@ -29,6 +29,8 @@ exclude = [
   "https://img.shields.io/.*",
   # Contributor Covenant — blocks/resets automated requests
   "https://www.contributor-covenant.org/.*",
+  # Claude (Anthropic) — bot-protected, returns 403 to automated checks
+  "https://claude.ai/.*",
   # Example/placeholder URLs
   "https://example.com.*"
 ]

README.md

@@ -42,6 +42,8 @@ pnpm install
 cd api && pnpm dev
 ```
 
+> **New to Nerva?** See the [Todo API example](examples/todo-api-cloudflare/) for a complete working Cloudflare Workers project with CRUD, D1, Zod validation, and tests.
+
 ## Pipelines
 
 ### Schema-to-API (Autonomous)