docs(clients): add npm and Maven Central version badges

The @microsoft/agent-host-protocol npm package is now published, so
add the standard shields.io npm version badge to the TypeScript
section of the Clients guide. Add a matching Maven Central badge to
the Kotlin section for parity (both per-client READMEs already use
these badges).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: colbylwilliams

docs/guide/clients.md

@@ -49,6 +49,8 @@ A single browser- and Node-friendly package on
 with four subpath entry points (wire types, client, multi-host
 orchestration, WebSocket transport):
 
+[![npm](https://img.shields.io/npm/v/@microsoft/agent-host-protocol.svg)](https://www.npmjs.com/package/@microsoft/agent-host-protocol)
+
 ```bash
 npm install @microsoft/agent-host-protocol
 ```
@@ -68,6 +70,8 @@ Pure Kotlin/JVM artifact on
 Targets Java 8 bytecode, so it can be consumed unchanged from
 Android, server-side JVM services, and KMP/JVM targets.
 
+[![Maven Central](https://img.shields.io/maven-central/v/com.microsoft.agenthostprotocol/agent-host-protocol)](https://central.sonatype.com/artifact/com.microsoft.agenthostprotocol/agent-host-protocol)
+
 ### Gradle (Kotlin DSL)
 
 ```kotlin