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* feat(vision-bridge): add automatic image description fallback for non-vision models Implements VisionBridgeGuardrail (priority 5) that intercepts image-bearing requests to non-vision models, extracts descriptions via a configurable vision model (default: gpt-4o-mini), and replaces images with text before forwarding. Fails open on any error. - Add VisionBridgeGuardrail class extending BaseGuardrail - Add visionBridgeHelpers: extractImageParts, callVisionModel, replaceImageParts, resolveImageAsDataUri - Add visionBridgeDefaults with configurable settings - Register VisionBridgeGuardrail in GuardrailRegistry at priority 5 - Add 51 unit tests covering all spec scenarios (VB-S01 through VB-S10) - Dependency injection for getSettings and callVisionModel (testable without SQLite) Closes diegosouzapw/OmniRoute#1424 * fix(vision-bridge): resolve Anthropic API, parallel processing, provider keys, structuredClone