feat(#3996): resolve image output capability from models.dev - #4019
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Add ModelConfig.OutputCapabilities (output_capabilities.image in YAML), a latest-only tri-state override for a model's generative output capability. Explicit false has highest precedence, explicit true follows, and an omitted flag — including output_capabilities: {} — is left for models.dev resolution in the following commit. No capability is ever inferred from the model name.
Reject output_capabilities on first_available selectors because one block cannot unambiguously describe every candidate. Update the schema, model docs, and example, and cover true, false, omitted, and empty-block YAML states, shorthand behavior, cloning, schema strictness, and selector validation.
Resolve image-output capability with one explicit precedence chain: false disables it, true enables it, and an omitted image flag — whether output_capabilities is absent or {} — enables it only when the exact known models.dev record lists image in Modalities.Output. Unknown models, unavailable catalogue data, and lookup failures stay off.
Keep lookup case-insensitive and bounded by the existing models.dev timeout. Capability is never inferred from provider or model-name patterns.
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What and why
Add latest-only
output_capabilities.imageconfiguration/schema support. Explicit true or false wins. Omitted, empty, or unset metadata consults exact provider-qualified models.dev output metadata; unknown models, unavailable providers, and lookup failures remain disabled. No capability is inferred from a model-name prefix. Numbered configuration packages remain frozen.Part of #3996. Review this PR against its immediate parent, #4017, rather than the aggregate stack against
main.Commit inventory
Head:
51559ff510bf01ea053e3923c329c80ba724dca5; parent SHA:2c5fd913464ef376471cc098b8e9481367f16b6a.b705039ca893933097887e9bbc66ba90231e34f3— feat(Epic: Gemini image output with workspace deliverables and portable session copies #3996): add output_capabilities.image model override51559ff510bf01ea053e3923c329c80ba724dca5— feat(Epic: Gemini image output with workspace deliverables and portable session copies #3996): resolve image output capability from models.devValidation
Build, test compilation, owning-package tests and the named fixture passed at this PR head.
Exact deterministic fixture command:
Matched top-level tests:
pkg/config/latest: 7;pkg/modelinfo: 1.Deterministic scope: the named local fixture exercises this PR boundary with disposable configuration/stores and fake or loopback providers as applicable. Every listed package ran nonzero matching top-level tests.
Deferred/live scope: No new live catalogue/provider run was executed; deterministic resolution covers explicit and omitted metadata. The final stack head passed build, lint, full tests, an uncached full suite, focused race tests and documentation checks in disposable environments. Remote CI is tracked by the checks below; no new paid-provider or active-database validation was run.