Alexander Whitestone c643ac90da feat: wire Gemma 4 vision into browser_tool for screenshot analysis ...

- Add `_BROWSER_VISION_DEFAULT_MODEL = "google/gemma-4-27b-it"` constant
- Rewrite `_get_vision_model()` with 4-tier resolution:
    1. BROWSER_VISION_MODEL env var (browser-specific override)
    2. auxiliary.browser_vision.model config key
    3. AUXILIARY_VISION_MODEL env var (backward compat)
    4. Gemma 4 27B default
- Remove `if vision_model:` guard — function now always returns a string
- Update browser_vision tool description to surface Gemma 4 as default
- Register gemma-4-27b-it in Gemini provider model catalog (models.py)
- Document auxiliary.browser_vision.model in cli-config.yaml.example
- Add 14 unit tests covering all priority levels and backward compat

Fixes #816

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-04-21 18:47:03 -04:00

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