Move test model to existing SemAnno.sandbox

- Moved SimpleExample.mps to languages/SemAnno.sandbox/models/
- Removed redundantly created sandbox directory
- Test model now in the correct, existing sandbox location

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

.claude/settings.local.json

@@ -1,7 +1,9 @@
 {
   "permissions": {
     "allow": [
-      "Bash(ls:*)"
+      "Bash(ls:*)",
+      "Bash(git add:*)",
+      "Bash(git commit -m \"$\\(cat <<''EOF''\nAdd textgen definitions for all Phase 1 AST concepts\n\n- Added ConceptTextGenDeclaration nodes for all 38 Phase 1 concepts\n- Includes textgen rules for core concepts \\(Module, Function, Parameter, Variable\\)\n- Textgen rules for statements \\(Block, Assignment, If, Loops, Return, etc.\\)\n- Textgen rules for expressions \\(BinaryOp, UnaryOp, FunctionCall, Literals, etc.\\)\n- Textgen rules for types \\(Primitive, List, Set, Map, Tuple, Array, Optional, Custom\\)\n- Textgen rules for annotations \\(Annotation, DerefStrategy, OptimizationLock, LangSpecific\\)\n\nCo-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>\nEOF\n\\)\")"
     ]
   }
 }

sandbox/.mps

@@ -1,11 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module version="9" compileInMPS="true">
-  <models>
-    <modelRoot path="models" namespaceProvider="true" />
-  </models>
-  <accessoryModels />
-  <languageAccessories />
-  <dependencies>
-    <dependency reexport="false">e209a700-5f8c-468c-afcc-f38277628970(SemAnno.structure)</dependency>
-  </dependencies>
-</module>