Add model-reviewed CAD experience pipeline

.gitignore

@@ -14,9 +14,26 @@
 **/.next/
 **/.cache/
 
+# Undownloaded upstream Git LFS demo/catalog pointers
+text-to-cad/assets/
+text-to-cad/benchmarks/*.gif
+text-to-cad/models/benchmarks/
+text-to-cad/models/fun/
+text-to-cad/models/mechanisms/
+text-to-cad/models/robots/
+text-to-cad/models/simple/
+
 # Local editors and temporary files
 **/.idea/
 **/.vscode/
 *.swp
 *.tmp
 
+# Private STEP evidence and local induction run reports
+cad-experience-plugin/work/
+
+# STEP inbox and private per-part reconstruction JSON
+cad-experience-plugin/parser/input/*
+!cad-experience-plugin/parser/input/.gitkeep
+cad-experience-plugin/parser/output/*
+!cad-experience-plugin/parser/output/.gitkeep