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>
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>
