fix(#3996): keep image-output models eligible for session titles - #4021
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Title generation is an explicitly text-only call, so image-output-capable models remain valid title candidates and may fall through to the next model on failure. Preserve title_model -> agent model -> fallbacks order, skip nil providers, and return nil only when no configured candidate remains. Apply the same construction behavior to LocalRuntime, the server session path, and the debug title command. Tests pin image-output candidate ordering, fallback, and isolation from the main generation stream.
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What
Keeps image-output-capable models eligible for session-title generation while preserving the title-generation model filter and configuration behavior.
Why
Title generation should not discard otherwise valid models merely because they advertise image output.
Validation
task test; session-title, runtime, server, and configuration tests.Test instructions
Run:
task testConfigure an image-output-capable model and create a normal session that requires title generation. Expected: the model remains eligible for title generation, a title is produced, and the existing title-generation filtering behavior is preserved.