Agents docs: add chat agents, retries, and sync with SDK changes

src/content/docs/agents/api-reference/agents-api.mdx

@@ -87,6 +87,7 @@ flowchart TD
 | **Workflows**        | `runWorkflow()`, `waitForApproval()`                                  | [Run Workflows](/agents/api-reference/run-workflows/)               |
 | **MCP Client**       | `addMcpServer()`, `removeMcpServer()`, `getMcpServers()`              | [MCP Client API](/agents/api-reference/mcp-client-api/ )    |
 | **AI Models**        | Workers AI, OpenAI, Anthropic bindings                                | [Using AI models](/agents/api-reference/using-ai-models/)           |
+| **Protocol messages** | `shouldSendProtocolMessages()`, `isConnectionProtocolEnabled()`      | [Protocol messages](/agents/api-reference/protocol-messages/)       |
 | **Context**          | `getCurrentAgent()`                                                   | [getCurrentAgent()](/agents/api-reference/get-current-agent/)       |
 | **Observability**    | `observability.emit()`                                                | [Observability](/agents/api-reference/observability/)               |
 
@@ -143,7 +144,7 @@ For AI chat applications, extend `AIChatAgent` instead of `Agent`:
 ```ts
 import { AIChatAgent } from "agents/ai-chat-agent";
 
-class ChatAgent extends AIChatAgent<Env> {
+class ChatAgent extends AIChatAgent {
 	async onChatMessage(onFinish) {
 		// this.messages contains the conversation history
 		// Return a streaming response
@@ -179,7 +180,7 @@ export default {
 			new Response("Not found", { status: 404 })
 		);
 	},
-};
+} satisfies ExportedHandler<Env>;
 ```
 
 Refer to [Routing](/agents/api-reference/routing/) for custom paths, CORS, and instance naming patterns.

src/content/docs/agents/api-reference/browse-the-web.mdx

@@ -29,7 +29,7 @@ interface Env {
 	BROWSER: Fetcher;
 }
 
-export class MyAgent extends Agent<Env> {
+export class MyAgent extends Agent {
 	async browse(browserInstance: Fetcher, urls: string[]) {
 		let responses = [];
 		for (const url of urls) {
@@ -116,7 +116,7 @@ interface Env {
 	BROWSERBASE_API_KEY: string;
 }
 
-export class MyAgent extends Agent<Env> {
+export class MyAgent extends Agent {
 	constructor(env: Env) {
 		super(env);
 	}

src/content/docs/agents/api-reference/callable-methods.mdx

@@ -543,7 +543,7 @@
 
 		return Response.json(result);
 	},
-};
+} satisfies ExportedHandler<Env>;
 ```
 
 </TypeScriptExample>
@@ -710,12 +710,12 @@
 
 ### `SyntaxError: Invalid or unexpected token`
 
 If your dev server fails with `SyntaxError: Invalid or unexpected token` when using `@callable()`, set `"target": "ES2021"` in your `tsconfig.json`. This ensures that Vite's esbuild transpiler downlevels TC39 decorators instead of passing them through as native syntax.
 
 ```json
 {
 	"compilerOptions": {
 		"target": "ES2021"
 	}
 }
 ```