Add editor definitions for all 31 Phase 1 AST concepts
Created editors for:
- 4 core nodes: Module, Function, Parameter, Variable
- 7 statement types: Block, Assignment, IfStatement, WhileLoop, ForLoop, Return, ExpressionStatement
- 13 expression types: BinaryOp, UnaryOp, FunctionCall, VariableRef, Literals, ListLiteral, Access
- 8 type system concepts: PrimitiveType, ListType, SetType, MapType, TupleType, ArrayType, OptionalType, CustomType
All editors reference correct concept IDs from fixed structure.mps.
Editors use horizontal and vertical layouts for proper rendering.
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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