fix(patch): cherry-pick 62364cb to release/v0.61.0-preview.0-pr-29443 to patch version v0.61.0-preview.0 and create version 0.61.0-preview.1

[gemini-cli-robot]

This PR automatically cherry-picks commit 62364cb to patch version v0.61.0-preview.0 in the preview release to create version 0.61.0-preview.1.

[github-actions]

📊 PR Size: size/XL

• Lines changed: 1695
• Additions: +1346
• Deletions: -349
• Files changed: 40

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces support for the latest GA models, gemini-3.5-flash-lite and gemini-3.8-flash, by updating the core configuration and routing logic. It refactors existing model-specific flags into more flexible 'latest' flags and ensures that backend requests are correctly mapped. Additionally, it updates various unit and integration tests to accommodate these changes and maintain robust fallback behavior.

Highlights

• Model Updates: Added support for the latest GA models, specifically gemini-3.5-flash-lite and gemini-3.8-flash, across the configuration and routing layers.
• Refactoring Model Flags: Replaced specific model flags with generic 'useLatestFlash' and 'useLatestFlashLite' flags to simplify model selection and improve maintainability.
• Configuration & Schema: Updated settingsSchema.ts and defaultModelConfigs.ts to include the new models and ensure they are correctly exposed in the application configuration.
• Backend Mapping: Introduced dynamic backend model mapping to ensure requests are routed to the correct model versions based on experiment flags.

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[github-actions]

Size Change: +9.76 kB (+0.03%)

Total Size: 35.4 MB

Filename	Size	Change
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./bundle/chunk-ZFE6MEFM.js	663 kB	+663 kB (new file)	🆕
./bundle/core-JBIFJDI6.js	52.1 kB	+52.1 kB (new file)	🆕
./bundle/devtoolsService-NLV2NLX2.js	147 kB	+147 kB (new file)	🆕
./bundle/gemini-5RUULPKV.js	642 kB	+642 kB (new file)	🆕
./bundle/interactiveCli-COQ2AQXN.js	1.31 MB	+1.31 MB (new file)	🆕
./bundle/liteRtServerManager-HFHK5O7S.js	2.08 kB	+2.08 kB (new file)	🆕
./bundle/oauth2-provider-RGLHNRWT.js	9.12 kB	+9.12 kB (new file)	🆕

ℹ️ View Unchanged

Filename	Size	Change
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./bundle/cleanup-3CVYCU6G.js	902 B	+902 B (new file)	🆕
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_{compressed-size-action}

[gemini-code-assist]

Code Review

This pull request introduces support for the latest GA models, Gemini 3.8 Flash and Gemini 3.5 Flash Lite, by gating them behind experiment flags and updating model resolution, fallback strategies, and configuration schemas. The review feedback highlights two critical issues: first, a correctness bug in contentGenerator.ts where passing gcConfig instead of the full config to getBackendModelMappings disables dynamic mapping to the latest models; second, an architectural risk in models.ts where mutating module-level global variables for active defaults can cause race conditions and state leakage across concurrent sessions.

_{Note: Security Review did not run due to the size of the PR.}