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-lock.json

@@ -1,12 +1,12 @@
 {
-  "name": "@a2amcp/mcp",
-  "version": "0.1.1",
+  "name": "a2amcp",
+  "version": "0.1.2",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
-      "name": "@a2amcp/mcp",
-      "version": "0.1.1",
+      "name": "a2amcp",
+      "version": "0.1.2",
       "license": "Apache-2.0",
       "dependencies": {
         "@modelcontextprotocol/sdk": "^1.0.4",