Passkey auth in the cmux browser

cmux's browser now supports passkey authentication. Sign-in flows that depend on passkeys, WebAuthn, Touch ID, or hardware security keys can complete inside a cmux browser pane.

If you already use another browser for the same site, import compatible cookies once:

cmux browser import

Requires cmux v0.64+. This helps when Claude Code, Codex, OpenCode, Gemini CLI, or another agent needs to test an authenticated local app without leaving cmux.