Use latest Gemini subscription model by default

[ygpark80]

User description

Summary

• update Prism Gemini default to gemini-3.8-flash-high
• synchronize CLI help, README, and regression tests

Verification

• go test ./...
• real prism gemini probe returned GEMINI_FINAL_38_OK
• Antigravity metadata recorded gemini-3.8-flash-high with used_claude=false and used_non_gemini_model=false

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CodeAnt-AI Description

Use Gemini 3.8 Flash High as the default subscription model

What Changed

• prism gemini now uses gemini-3.8-flash-high when no model is specified
• Explicit model selections continue to be preserved
• CLI help and README examples now document the new default model

Impact

✅ Latest Gemini subscription model by default
✅ Existing custom model choices remain unchanged
✅ Consistent model guidance across CLI help and documentation

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🤖 CodeAnt AI — Review Status

Status	Commit	Started (UTC)	Finished (UTC)
✅ Reviewed your PR	3fdc46f	Sep 04, 2026 · 05:00	05:02

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