changelog.d/4971-cli-google-login-unavailable.md

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- ⚠️ **Behaviour change: `crewship login --google` now reports that Google sign-in is unavailable before contacting a server.** Google redirect and callback routes are disabled; the CLI no longer starts the legacy browser/token-paste flow against older servers. Use email/password, `--token` or `--pair` instead. Help and login documentation now describe the supported modes.