* feat(cli): librarian uses gemini-3-flash when hasGemini (antigravity auth)
Closes#294
* feat(cli): add explore to gemini-3-flash when hasGemini + update docs
* feat(cli): fix explore agent fallback logic to use haiku for max20 Claude users
- Use gemini-3-flash for both librarian and explore when hasGemini
- Use haiku for explore when Claude max20 is available (hasClaude && isMax20)
- Fall back to big-pickle for both when other models unavailable
- Updated all README files to document the fallback precedence
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