Add agent skill documentation section to README.md explaining SKILL.md file purpose, prerequisites coverage, safety rules, script catalog structure, and installation instructions for Devin and Claude Code agents, with repository location notes for both SVN and Git versions

Upscalers.md

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+# Upscalers - upscayl-bin Windows 11 — Command-Line Installation Guide
+
+There are two pieces you need: the **binary** (the `upscayl-bin` executable) and the **model** (upscayl models).
+
+---
+
+## Step 1 — Download the Binary
+
+The upscayl-bin binary can be downloaded from the official upscayl repository or from the releases page.
+
+1. Go to: [https://github.com/TNTwise/Universal-NCNN-Upscaler/releases](https://github.com/TNTwise/Universal-NCNN-Upscaler/releases)
+2. Download the latest Windows zip, e.g. `upscayl-bin-YYYYMMDD-windows.zip`
+3. Extract it to a folder, e.g. `C:\tools\upscayl-bin\`
+
+The package includes all binaries required — it is portable, so no CUDA or PyTorch runtime environment is needed.
+
+---
+
+## Step 2 — Add to PATH
+
+To run `upscayl-bin.exe` from any directory (instead of always `cd`-ing into the install folder), add the extraction folder to your system **PATH**:
+
+```text
+C:\tools\upscayl-bin\
+```
+
+Then open a new terminal and verify:
+
+```powershell
+upscayl-bin -h
+```
+
+## Step 3 — Download Models
+
+The models can be downloaded from the links found in the `README.md` file of the upscayl-bin directory.
+
+The default model used by the scripts is the `4xNomos8kSC` model.
+
+1. Go to: [https://github.com/TNTwise/Upscaling-Models-NCNN/releases/tag/Realistic](https://github.com/TNTwise/Upscaling-Models-NCNN/releases/tag/Realistic)
+2. Download the `4xNomo8kSC.zip` file
+3. Extract the 2 files (`4xNomos8kSC.bin` and `4xNomos8kSC.param`) directly to the root of the **models** directory (create it if it doesn't exist) in `upscayl-bin`, e.g. `C:\tools\upscayl-bin\models\`
+
+You can also download other models if you want to use them instead of the default `4xNomos8kSC` model. They should be extracted to the same `models` directory.
+
+---
+
+## Step 4 - Set UPSCAYL_HOME
+
+The scripts that use upscayl-bin (for example `Clone-Image.ps1 -Upscale`) read the environment variable **UPSCAYL_HOME**. Set it to the same folder that is on PATH. The models are read from `%UPSCAYL_HOME%\models`:
+
+```text
+UPSCAYL_HOME=C:\tools\upscayl-bin\
+```
+
+Set the variable as a persistent user or system environment variable, then open a new terminal. The scripts also need `NCNN_GPU_ID`; see [NCNN_GPU_ID](index.md#ncnn_gpu_id).