Add platform support note and existing file handling documentation to README and skill docs, clarifying Windows 11-only testing, per-script ffmpeg/ffprobe requirements, and file replacement behavior with -y flag across Clone-Image.md, Clone-Video.md, Compare-Videos.md, Crop-Clips.md, Get-VideoAudio.md, SKILL.md and index.md

skill/SKILL.md

@@ -9,8 +9,9 @@ A collection of PowerShell 7 scripts that wrap ffmpeg and ffprobe for video and
 
 ## Prerequisites
 
+- **Platform**: Windows 11 only. The scripts are tested on Windows 11 and nowhere else. Do not run them on Linux or WSL, because those platforms are not supported.
 - **PowerShell 7+** (`pwsh`). Required by every script.
-- **ffmpeg** and **ffprobe** on `PATH`. Required by every video script.
+- **ffmpeg** and **ffprobe** on `PATH`. Most scripts need both. [Stitch-InBetween.ps1](Stitch-InBetween.md) needs only ffmpeg. [Get-FramesCount.ps1](Get-FramesCount.md), [Get-VideoInfo.ps1](Get-VideoInfo.md) and [Create-FullSubtitle.ps1](Create-FullSubtitle.md) need only ffprobe.
 - **rife-ncnn-vulkan** on `PATH`, with `RIFE_HOME` set. Required by [Stitch-InBetween.ps1](Stitch-InBetween.md). See [RIFE installation guide](RIFE.md).
 - **upscayl-bin** on `PATH`, with `UPSCAYL_HOME` set. Required by [Clone-Image.ps1](Clone-Image.md) when `-Upscale` is used. See [Upscalers installation guide](Upscalers.md).