Login hangs in headless/CLI environments

[Alan-221b]

Bug: Login command hangs in headless/CLI environments

Problem

When running keyway login in certain CLI environments (VS Code integrated terminal, SSH sessions, headless servers), the login flow hangs after displaying the verification URL. The CLI never starts polling for OAuth completion.

Root Cause

The browser.OpenURL() call is blocking in these environments. The function waits for the browser process to complete, which prevents the polling loop from starting.

Current Behavior

│ Code: ABCD-1234
│ Open: https://api.keyway.sh/v1/auth/device/verify?user_code=ABCD-1234
[hangs indefinitely - no "Waiting for authorization..." spinner]

Expected Behavior

The CLI should display the URL, attempt to open the browser non-blocking, and immediately start polling for OAuth completion.

Solution

1. Run browser.OpenURL() in a goroutine to avoid blocking
2. Add a helpful message for users in environments where the browser doesn't open automatically

Affected File

• internal/cmd/login.go