Feature: expose install logic as a programmatic JS library

[domdomegg]

The per-client config writers in src/client-config.ts could be useful as a library for embedding install instructions in a landing page. However, package.json currently only exports bin as a CLI to actually do the installation.

Proposed: expose a library entry point that returns "instructions for installing" rather than actually installing:

import { renderInstallInstructions } from 'install-mcp';

renderInstallInstructions({
  server: { url: 'https://mcp.example.com/mcp' },
  client: 'claude-desktop',
});
// -> { configJson, configFilePath, steps }

src/detect-transport.ts is already browser-compatible and src/client-config.ts has most of the logic — mainly needs the render/write split.

[domdomegg]

For anyone landing here: I built mcp-install-instructions which does basically just this, so probably don't need this issue anymore.