Google now rejects personal Google accounts on the Gemini CLI OAuth login
("This client is no longer supported for Gemini Code Assist for individuals").
The setup docs previously sent every user down "Sign in with Google" with no
warning. Note the block, recommend GEMINI_AUTH=apikey for personal accounts,
and clarify that real-time search fail-opens to DDG/Brave/Wikipedia regardless.
Docs only; no runtime default change.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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