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* feat(image-search): expose the color and license_image filters
`_search_images` accepts `color` and `license_image` and forwards them into the
`f` filter payload that `ddgs`'s duckduckgo_images engine builds
(`duckduckgo_images.py:62-79`), so the provider already declares support for
both. But `image_search_tool` never took them as parameters and never passed
them, so no caller -- model or config -- could set either one. They were dead
parameters: declared, wired, and unreachable.
Both matter for this tool's stated purpose, which is sourcing reference images
for image generation: `color` narrows results to the palette being generated,
and `license_image` filters to license-cleared results when the reference will
be redistributed.
Expose them on `image_search_tool` alongside the existing `size` /
`type_image` / `layout` filters and pass them through. `_search_images` only
forwards truthy filters, so an unset filter still produces the same request as
before.
Adds two regression tests: one asserting both filters reach the DDGS call
(red on main with `KeyError: 'color'`), one pinning that unset filters stay out.
* fix(image-search): add a usage hint to the color filter docstring
The sibling filters each carry a usage hint ("Use \"Large\" for reference
images", "Use \"photo\" for realistic references"), but `color` only listed
its options. Since this docstring is the model's parameter surface, add a
short hint so the model knows when the filter applies, and note that
"color" means full-color rather than a meta-parameter.
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Co-authored-by: RXQ6 <RXQ6@users.noreply.github.com>