v1.5.1: chore: 1.5.1 - add mcpName + server.json for official MCP Registry

Publishes io.github.PramodDutta/browserbash to the official MCP
Registry (registry.modelcontextprotocol.io). mcpName in package.json
is the ownership proof the registry validates against the npm package;
server.json is the registry manifest. No runtime change.