refactor(compiler): Move an enum to enums.ts for Template Pipeline

This enum belongs in the main enums file.

packages/compiler/src/template/pipeline/ir/src/enums.ts

@@ -528,3 +528,13 @@ export enum DeferTriggerKind {
   Interaction,
   Viewport,
 }
+
+/**
+ * Repeaters implicitly define these derived variables, and child nodes may read them.
+ */
+export enum DerivedRepeaterVarIdentity {
+  First,
+  Last,
+  Even,
+  Odd,
+}

packages/compiler/src/template/pipeline/ir/src/expression.ts

@@ -820,13 +820,6 @@ export class ConditionalCaseExpr extends ExpressionBase {
   }
 }
 
-export enum DerivedRepeaterVarIdentity {
-  First,
-  Last,
-  Even,
-  Odd,
-}
-
 export class DerivedRepeaterVarExpr extends ExpressionBase {
   override readonly kind = ExpressionKind.DerivedRepeaterVar;