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>

README.md

@@ -1,4 +1,4 @@
-# @a2amcp/mcp
+# a2amcp
 
 MCP gateway for a2acloud agents. It runs locally as a stdio MCP server and
 exposes deployed A2A agents as tools to Claude Code, Cursor, and other MCP
@@ -7,9 +7,9 @@ clients.
 ## Quickstart
 
 ```bash
-npx -y @a2amcp/mcp login
-npx -y @a2amcp/mcp add <agent-name>
-npx -y @a2amcp/mcp doctor
+npx -y a2amcp login
+npx -y a2amcp add <agent-name>
+npx -y a2amcp doctor
 ```
 
 Add it to your MCP client config:
@@ -19,7 +19,7 @@ Add it to your MCP client config:
   "mcpServers": {
     "a2a": {
       "command": "npx",
-      "args": ["-y", "@a2amcp/mcp"]
+      "args": ["-y", "a2amcp"]
     }
   }
 }