The capture route only checked "does the provider carry tool-result
media", never `agent.image_input_mode` or a catalog verdict that the
model cannot see. deepseek-v3.2 on OpenRouter therefore went native, the
agent backstop swapped the screenshot for a "switch to a vision-capable
model" error, and the configured auxiliary vision describer never ran;
`image_input_mode: text` was ignored for screenshots too.
`tools.vision_tools._native_tool_result_images(provider, model, cfg)` is
now the one gate for every tool that hands the model pixels
(vision_analyze, browser screenshots, computer_use captures, MCP images):
image routing resolves to native AND the route accepts tool-result
images. The capture route is its negation, which drops three local
helpers that duplicated image_routing. Proxy aliases the catalog does
not know still go native under `image_input_mode: native` (#115248's
case); `auto` sends them to aux, matching vision_analyze.
Tests: test_computer_use_vision_routing.py is rewritten to drive the
real gate (the old cases patched the removed helpers). Changed
assertions: "whitelisted provider + catalog-unknown model" now requires
image_input_mode: native (it carried that cfg already); new cases pin
catalog text-only -> aux and image_input_mode: text -> aux.
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