release: 0.1.3 — add a2amcp bin, sync server/cli version from package.json

Adds an "a2amcp" bin (alongside the existing "a2a-mcp" for back-compat)
so that npx -y a2amcp resolves the binary by package name. Without it
npx fell back unreliably when no bin matched.

Also rips the hardcoded "0.1.0" out of cli.ts and gateway.ts and reads
the version from package.json — that was why serverInfo lagged behind
the published tag. Renames the user-facing command in help / error
strings / README from a2a-mcp to a2amcp; the legacy bin stays for
existing scripts.

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

README.md

@@ -30,14 +30,14 @@ Restart the client after adding or removing agents.
 ## Commands
 
 ```bash
-a2a-mcp login              # save control-plane credentials
-a2a-mcp whoami             # show current account
-a2a-mcp agents             # list agents visible to your account
-a2a-mcp add <name>         # expose one agent through this gateway
-a2a-mcp list               # list locally enabled agents
-a2a-mcp remove <name>      # stop exposing an agent
-a2a-mcp doctor             # probe enabled agents and count tools
-a2a-mcp logout             # clear local credentials
+a2amcp login              # save control-plane credentials
+a2amcp whoami             # show current account
+a2amcp agents             # list agents visible to your account
+a2amcp add <name>         # expose one agent through this gateway
+a2amcp list               # list locally enabled agents
+a2amcp remove <name>      # stop exposing an agent
+a2amcp doctor             # probe enabled agents and count tools
+a2amcp logout             # clear local credentials
 ```
 
-Running `a2a-mcp` with no command starts the MCP gateway over stdio.
+Running `a2amcp` with no command starts the MCP gateway over stdio.