Add an example to showcase how to setup authentication with better-auth.

[Muhammad-Bin-Ali]

Add examples/auth-agent — better-auth + JWT authentication for Agents

New example demonstrating how to secure a Cloudflare Agents server with better-auth, JWT authentication, and Cloudflare D1.

• Cookie-based session auth for the browser, JWT via query param for WebSocket connections
• JWT verification reads JWKS directly from D1 using jose's createLocalJWKSet (avoids Worker self-request)
• onBeforeConnect and onBeforeRequest middleware protect agent WebSocket and HTTP routes
• Full React UI with sign-up/sign-in and authenticated chat, styled with Kumo
• Comprehensive README documenting architecture, auth flow, and design decisions with rationale

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Latest commit: 1b41e0b

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npm i https://pkg.pr.new/cloudflare/agents@948

npm i https://pkg.pr.new/cloudflare/agents/@cloudflare/ai-chat@948

npm i https://pkg.pr.new/cloudflare/agents/@cloudflare/codemode@948

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commit: 1b41e0b