The video_gen toolset and its video_generate tool shipped without
user-facing reference docs. toolsets-reference.md and the dev-guide
plugin page were already in, but reference/tools-reference.md had no
video_gen section at all and user-guide/features/tools.md's Media row
didn't list video_generate.
- reference/tools-reference.md: add a video_gen section after video,
including backend list (xAI Grok-Imagine, FAL.ai Veo/Pixverse/Kling),
unified text-to-video / image-to-video surface note, link to the
dev-guide plugin page, and the video_generate tool row. Add
video_generate to the standalone-tools quick-counts line.
- user-guide/features/tools.md: extend Media row with video_generate
and video_analyze plus an opt-in caveat.
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