Add WallCraft AI MVP scaffolding and documentation

quick-start.md

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+WallCraft AI Quick Start (MVP)
+
+What you’ll get
+- A cloud-driven FoundryVTT MVP to generate walls (including doors/windows) for the current scene.
+- Non-destructive preview with manual adjustments before applying.
+
+Setup
+- Install FoundryVTT module (WallCraft AI) for FoundryVTT v13.0.351
+- Configure cloud endpoint URL and API token in Settings
+- Ensure the cloud AI endpoint is reachable via HTTPS
+
+How to use
+- In FoundryVTT, open a scene and click the WallCraft AI Prep button in the Scene toolbar
+- The module collects scene data and sends a fixed prompt to the cloud AI
+- See a translucent preview of AI-generated walls
+- Use the adjustment panel to tweak endpoints or types if needed
+- Click Apply to persist walls to the scene
+- Review chat/journal log for traceability
+
+Notes
+- Batching and multi-scene processing are not part of MVP; plan for future sprints if you want to scale.
+- Security: only necessary scene data is sent; token remains with you.
+
+Next steps
+- If you’d like, I can generate concrete starter patches (module.json + a minimal AIPrep.js skeleton and the SettingsPanel), plus the exact payload shapes ready to patch into your repo. I can also tailor naming and endpoint paths to your preferred conventions.