[refactor] Rename task types in test files to avoid schema cache pollution

Root Cause: Test pollution from shared static schema cache.
The Task class has a static _inputSchemaNode: Map<string, SchemaNode> that caches compiled schemas keyed by the task's type property. Two different test files defined task classes with the same static type values ("TaskA", "TaskB") but with different schemas:
GraphAsTask.test.ts: TaskB expects inputB: { type: "string" }
IteratorTask.test.ts: TaskB expects required: ["result"]
When tests run in a different order on CI vs locally, the static cache from one test would pollute the other:
IteratorTask.test.ts runs first and caches a schema for "TaskB" that requires result
GraphAsTask.test.ts runs later and uses that cached schema, causing the validation error
Fix: Added unique prefixes to the type names to avoid cache collisions:
GraphAsTask.test.ts: "GraphAsTask_TaskA", "GraphAsTask_TaskB", "GraphAsTask_TaskC"
IteratorTask.test.ts: "IteratorTask_TaskA", "IteratorTask_TaskB"

Author: sroussey

packages/test/src/test/task-graph/IteratorTask.test.ts

@@ -1436,7 +1436,7 @@ describe("Workflow Integration - Template Graph Access", () => {
     }
 
     class TaskA extends Task<TaskInput, CompatibleOutput> {
-      public static type = "TaskA";
+      public static type = "IteratorTask_TaskA";
       public static inputSchema(): DataPortSchema {
         return {
           type: "object",
@@ -1457,7 +1457,7 @@ describe("Workflow Integration - Template Graph Access", () => {
     }
 
     class TaskB extends Task<CompatibleInput, TaskOutput> {
-      public static type = "TaskB";
+      public static type = "IteratorTask_TaskB";
       public static inputSchema(): DataPortSchema {
         return {
           type: "object",

packages/test/src/test/task/GraphAsTask.test.ts

@@ -3,8 +3,10 @@ import { DataPortSchema } from "@workglow/util";
 import { describe, expect, it } from "vitest";
 
 // Test tasks with specific input/output schemas
+// NOTE: These type names must be unique across all test files to avoid
+// static schema cache pollution in Task._inputSchemaNode
 class TaskA extends Task {
-  static type = "TaskA";
+  static type = "GraphAsTask_TaskA";
   static category = "Test";
 
   static inputSchema(): DataPortSchema {
@@ -45,7 +47,7 @@ class TaskA extends Task {
 }
 
 class TaskB extends Task {
-  static type = "TaskB";
+  static type = "GraphAsTask_TaskB";
   static category = "Test";
 
   static inputSchema(): DataPortSchema {
@@ -81,7 +83,7 @@ class TaskB extends Task {
 }
 
 class TaskC extends Task {
-  static type = "TaskC";
+  static type = "GraphAsTask_TaskC";
   static category = "Test";
 
   static inputSchema(): DataPortSchema {