release: rename package @a2a/mcp → @a2amcp/mcp, bump to 0.1.1

The @a2a scope on npm is owned by a different account, so PUT against
the registry 404'd. Move to @a2amcp/mcp (scope we control) and bump the
version so the publish workflow has a fresh tag to push.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
-  "name": "@a2a/mcp",
-  "version": "0.1.0",
+  "name": "@a2amcp/mcp",
+  "version": "0.1.1",
   "description": "MCP gateway for a2acloud agents. Run as a local MCP server; expose any number of deployed A2A agents to Claude Code, Cursor, and other MCP clients.",
   "type": "module",
   "bin": {