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* feat: add video_analyze tool for native video understanding Adds a video_analyze tool that sends video files to multimodal LLMs (e.g. Gemini) for analysis via the OpenRouter-compatible video_url content type. Mirrors vision_analyze in structure, error handling, and registration pattern. Key design: - Base64 encodes entire video (no frame extraction, no ffmpeg dep) - Uses 'video_url' content block type (OpenRouter standard) - Supports mp4, webm, mov, avi, mkv, mpeg formats - 50 MB hard cap, 20 MB warning threshold - 180s minimum timeout (videos take longer than images) - AUXILIARY_VIDEO_MODEL env override, falls back to AUXILIARY_VISION_MODEL - Same SSRF protection, retry logic, and cleanup as vision_analyze Default disabled: registered in 'video' toolset (not in _HERMES_CORE_TOOLS). Users opt in via: hermes tools enable video, or enabled_toolsets=['video']. * feat(video): add models.dev capability pre-check + CONFIGURABLE_TOOLSETS entry - Pre-checks model video capability via models.dev modalities.input before expensive base64 encoding. Fails early with helpful message suggesting video-capable alternatives (gemini, mimo-v2.5-pro). - Passes optimistically if model unknown or lookup fails. - Adds ModelInfo.supports_video_input() helper. - Adds 'video' to CONFIGURABLE_TOOLSETS and _DEFAULT_OFF_TOOLSETS so 'hermes tools enable video' works from CLI. - 8 new tests for the capability check (37 total). * refactor(video): remove models.dev capability pre-check Removes _check_video_model_capability and ModelInfo.supports_video_input. The vision_analyze tool doesn't pre-check image capability either — both tools rely on the same pattern: send request, handle API errors gracefully with categorized user-facing messages. The pre-check was inconsistent (only worked for some providers/models) so drop it for parity. * cleanup: compress comments, fix fragile timeout coupling - Replace _VISION_DOWNLOAD_TIMEOUT * 2 with hardcoded 60s (no silent breakage if vision timeout changes independently) - Strip verbose comments and redundant log lines throughout - No behavioral changes