🚀 Add Interactive CLI Docs with DeepGuide

.dg/.gitignore

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+# DeepGuide demo output
+.dg/casts/
+.dg/svg/

.dg/README.md

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+# DeepGuide Integration
+
+This directory holds configuration and interactive demo assets for [DeepGuide](https://github.com/deepguide/dg).
+
+To add your first demo, run:
+
+```bash
+bunx @deepguide/dg capture
+```

.dg/config.json

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+{
+  "version": "0.1.0",
+  "project": "scratch",
+  "casts": []
+}

.github/workflows/dg-validate.yml

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+name: Validate DeepGuide Casts
+on: [pull_request]
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: oven-sh/setup-bun@v1
+      - run: bunx @deepguide/dg validate

README.md

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 # A CLI Tool
 
+
+## Interactive CLI Demos (DeepGuide Ready!)
+
+This project is pre-configured for [DeepGuide](https://github.com/deepguide/dg) interactive terminal demos.
+
+To add your first demo:
+```bash
+bunx @deepguide/dg capture
+```
+
+Your demo will be auto-validated by CI after you push.
+
+
 ## **Test the Demo CLI**
 
 ```bash