release: rename to unscoped a2amcp, bump 0.1.2

Drops the @a2amcp/mcp scope so the npx invocation collapses to
`npx -y a2amcp` — one token instead of two, no scope to register or
remember.

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

package.json

@@ -1,6 +1,6 @@
 {
-  "name": "@a2amcp/mcp",
-  "version": "0.1.1",
+  "name": "a2amcp",
+  "version": "0.1.2",
   "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": {