Add WallCraft AI MVP scaffolding and documentation

progress.json

@@ -0,0 +1,12 @@
+[
+  {"id":"t-1","content":"Initialize module skeleton (module.json) and scaffolding","status":"in_progress","priority":"high"},
+  {"id":"t-2","content":"Implement SettingsPanel for endpoint/token/provider","status":"pending","priority":"high"},
+  {"id":"t-3","content":"Implement AIPrep.js to collect scene data and build payload","status":"pending","priority":"high"},
+  {"id":"t-4","content":"Implement AIEndpoint.js to call cloud API and handle responses","status":"pending","priority":"high"},
+  {"id":"t-5","content":"Implement PreviewLayer.js for non-destructive previews","status":"pending","priority":"high"},
+  {"id":"t-6","content":"Implement UIFlow.js to drive MVP flow","status":"pending","priority":"medium"},
+  {"id":"t-7","content":"Wire up Apply logic to convert AI walls to Foundry walls","status":"pending","priority":"high"},
+  {"id":"t-8","content":"Create documentation: quick-start, data/api contracts","status":"pending","priority":"medium"},
+  {"id":"t-9","content":"Add basic tests/manual validation plan","status":"pending","priority":"medium"},
+  {"id":"t-10","content":"Polish error handling, security notes","status":"pending","priority":"low"}
+]