Chat Modes -> Agents (#433)

* Migrating chat modes to agents now that's been released to stable

* Fixing collections

* Fixing names of agents

* Formatting

* name too long

* Escaping C# agent name

collections/kotlin-mcp-development.collection.yml

@@ -1,14 +1,22 @@
 id: kotlin-mcp-development
 name: Kotlin MCP Server Development
 description: Complete toolkit for building Model Context Protocol (MCP) servers in Kotlin using the official io.modelcontextprotocol:kotlin-sdk library. Includes instructions for best practices, a prompt for generating servers, and an expert chat mode for guidance.
-tags: [kotlin, mcp, model-context-protocol, kotlin-multiplatform, server-development, ktor]
+tags:
+  [
+    kotlin,
+    mcp,
+    model-context-protocol,
+    kotlin-multiplatform,
+    server-development,
+    ktor,
+  ]
 items:
   - path: instructions/kotlin-mcp-server.instructions.md
     kind: instruction
   - path: prompts/kotlin-mcp-server-generator.prompt.md
     kind: prompt
-  - path: chatmodes/kotlin-mcp-expert.chatmode.md
-    kind: chat-mode
+  - path: agents/kotlin-mcp-expert.agent.md
+    kind: agent
     usage: |
       recommended