Complete Cloudflare Agents integration with AG-UI events

Adds full AG-UI integration for Cloudflare Agents with both client and server support:

## Client-Side (CloudflareAgentsClient)
- Extends AbstractAgent for full AG-UI compatibility
- Connects to deployed Cloudflare Agents via WebSocket
- Emits all AG-UI lifecycle events (thinking, message, done, error)
- Supports middleware, subscribers, and state management
- Handles server-sent events (SSE) and NDJSON responses

## Server-Side (AIChatAgentAGUI)
- Extends AIChatAgent from @cloudflare/ai-agent
- Runs on Cloudflare Workers with Durable Objects
- Emits AG-UI events via AgentsToAGUIAdapter
- Users override generateResponse() for custom logic
- Returns SSE/NDJSON responses compatible with client

## Shared Components
- AgentsToAGUIAdapter: Converts Vercel AI SDK streams to AG-UI events
- helpers.ts: SSE and NDJSON response formatting utilities
- Clean exports in index.ts for easy integration

## Quality
- Build passes ✅
- Typecheck passes ✅
- Follows AG-UI TypeScript SDK patterns
- Updated README with comprehensive examples
- Added .gitignore and .npmignore for clean package

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: Klammertime

integrations/community/cloudflare-agents/typescript/.gitignore

@@ -0,0 +1,12 @@
+node_modules
+dist
+.turbo
+.wrangler
+*.log
+# Secrets - never commit these!
+.env*
+.dev.vars*
+# But keep example files
+!.env.example
+!.dev.vars.example
+reference

integrations/community/cloudflare-agents/typescript/.npmignore

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+src
+tsconfig.json
+tsup.config.ts
+jest.config.js
+tests
+.turbo
+.wrangler
+*.log
+
+# Secrets - never include in npm package
+.env*
+.dev.vars*
+
+# Keep example files
+!.env.example
+!.dev.vars.example