fix(delegate-task): reject stray backend-style categories

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/tools/delegate-task/task-schema.test.ts

@@ -0,0 +1,28 @@
+declare const require: (name: string) => any
+const { describe, expect, test } = require("bun:test")
+import { createDelegateTask } from "./tools"
+
+	describe("createDelegateTask schema", () => {
+	test("#given category arg #when tool is created #then category is constrained to available enum values", () => {
+		//#given
+		const toolDefinition = createDelegateTask({ manager: {} as never, client: {} as never, directory: "/tmp/test" })
+
+		//#when
+		const categorySchema = toolDefinition.args.category as unknown as {
+			def: {
+				type: string
+				innerType: {
+					def: { type: string }
+					options: string[]
+				}
+			}
+		}
+
+		//#then
+		expect(categorySchema.def.type).toBe("optional")
+		expect(categorySchema.def.innerType.def.type).toBe("enum")
+		expect(categorySchema.def.innerType.options).toContain("quick")
+		expect(categorySchema.def.innerType.options).toContain("deep")
+		expect(categorySchema.def.innerType.options).toContain("ultrabrain")
+	})
+})