fix(#3996): preserve Gemini user thinking budgets outside title generation - #4028
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…ation Title generation requests must omit thinkingConfig so image-capable Gemini models can produce a plain text title. Keep the explicit no-thinking behavior for MCP sampling and ordinary requests unchanged, including Gemini 3 minimum reasoning settings and Gemini 2.5 zero-budget suppression.
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What
Preserves Gemini user thinking budgets for ordinary image-output requests while retaining the special title-generation behavior, with guard and integration tests.
Why
Image-output requests must honor the user's configured reasoning budget; only title generation should use its constrained policy.
Validation
task test; Gemini client, modality, guard, and runtime/TUI integration tests.Test instructions
Run:
task testIssue a Gemini image-output request with a non-default user thinking budget and inspect the outgoing request. Expected: the configured budget is preserved. Trigger session title generation separately; expected: its constrained title-generation policy remains unchanged.