feat(cli): add gemini-auth command and alias support

README.md

@@ -76,6 +76,7 @@ Flynn provides a full CLI via the `flynn` binary (or `npx tsx src/cli/index.ts`
 | `flynn onboard` | Guided onboarding alias for setup wizard |
 | `flynn gmail-auth` | Authenticate with Gmail via OAuth2 |
 | `flynn gcal-auth` | Authenticate with Google Calendar via OAuth2 |
+| `flynn gemini-auth` | Store a Gemini API key in `~/.config/flynn/auth.json` |
 | `flynn skills` | List/install/manage skills |
 | `flynn companion` | Run a minimal companion node client against the gateway |
 
@@ -1708,6 +1709,7 @@ pnpm test
 | `FLYNN_DATA_DIR` | Override data directory (default: `~/.local/share/flynn`) |
 | `ANTHROPIC_API_KEY` | Anthropic API key (fallback) |
 | `OPENAI_API_KEY` | OpenAI API key (fallback) |
+| `GEMINI_API_KEY` | Gemini API key (fallback; `GOOGLE_API_KEY` also supported) |
 
 ## License