chore: remove unused AST imports

Drop AST imports from src/program.ts that became unused after moving subtree traversal into NodeWalker. This fixes the lint warnings reported in CI and keeps the parameter decorator refactor clean.

Author: jtenner

src/program.ts

@@ -86,61 +86,29 @@ import {
   ArrowKind,
 
   Expression,
-  ArrayLiteralExpression,
-  AssertionExpression,
-  BinaryExpression,
-  CallExpression,
-  ClassExpression,
-  CommaExpression,
-  ElementAccessExpression,
-  FunctionExpression,
   IdentifierExpression,
-  InstanceOfExpression,
-  LiteralExpression,
-  NewExpression,
-  ObjectLiteralExpression,
-  ParenthesizedExpression,
-  PropertyAccessExpression,
-  TernaryExpression,
-  TemplateLiteralExpression,
-  UnaryPostfixExpression,
-  UnaryPrefixExpression,
   LiteralKind,
   StringLiteralExpression,
 
   Statement,
-  BlockStatement,
   ClassDeclaration,
   DeclarationStatement,
-  DoStatement,
-  ExpressionStatement,
   EnumDeclaration,
   EnumValueDeclaration,
   ExportMember,
   ExportDefaultStatement,
   ExportStatement,
   FieldDeclaration,
-  ForOfStatement,
-  ForStatement,
   FunctionDeclaration,
-  IfStatement,
   ImportDeclaration,
   ImportStatement,
-  IndexSignatureNode,
   InterfaceDeclaration,
   MethodDeclaration,
   NamespaceDeclaration,
-  ReturnStatement,
-  SwitchCase,
-  SwitchStatement,
-  ThrowStatement,
-  TryStatement,
   TypeDeclaration,
   VariableDeclaration,
   VariableLikeDeclarationStatement,
   VariableStatement,
-  VoidStatement,
-  WhileStatement,
   ParameterKind,
   ParameterNode,
   TypeName,