feat: add mcp oauth cimd support - #3406
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Publishes a Client ID Metadata Document and offers it to authorization servers first, falling back to dynamic client registration. CIMD is the registration method preferred by the MCP 2025-11-25 spec and lets servers show "Crush" with its metadata on the consent screen.
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builds on #2911
this requires hosting this file at
https://charm.land/.well-known/oauth-client.jsonor somewhere similar{ "client_id": "https://raw.githubusercontent.com/charmbracelet/crush/refs/heads/mcp-oauth/oauth-client-metadata.json", "client_name": "Crush", "client_uri": "https://github.com/charmbracelet/crush", "redirect_uris": [ "http://localhost:40704/callback", "http://localhost:40705/callback", "http://localhost:40706/callback", "http://localhost:40707/callback", "http://localhost:40708/callback", "http://localhost:40709/callback", "http://localhost:40710/callback", "http://localhost:40711/callback", "http://localhost:40712/callback", "http://localhost:40713/callback" ] }