fix(delegate-task): reject primary agents in task subagent resolution

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

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

src/tools/delegate-task/delegated-model-config.ts

@@ -0,0 +1,20 @@
+import type { CategoryConfig } from "../../config/schema"
+import type { DelegatedModelConfig } from "./types"
+
+export function applyCategoryParams(
+  base: DelegatedModelConfig,
+  config: CategoryConfig | undefined,
+): DelegatedModelConfig {
+  if (!config) {
+    return base
+  }
+
+  return {
+    ...base,
+    ...(config.reasoningEffort !== undefined ? { reasoningEffort: config.reasoningEffort } : {}),
+    ...(config.temperature !== undefined ? { temperature: config.temperature } : {}),
+    ...(config.top_p !== undefined ? { top_p: config.top_p } : {}),
+    ...(config.maxTokens !== undefined ? { maxTokens: config.maxTokens } : {}),
+    ...(config.thinking !== undefined ? { thinking: config.thinking } : {}),
+  }
+}