feat(hooks): add delegate-task-english-directive hook to enforce English for subagents

Appends bold uppercase English-only directive to explore, librarian,
oracle, and plan subagent prompts via tool.execute.before on the task tool.

src/plugin/hooks/create-session-hooks.ts

@@ -16,6 +16,7 @@ import {
   createRalphLoopHook,
   createEditErrorRecoveryHook,
   createDelegateTaskRetryHook,
+  createDelegateTaskEnglishDirectiveHook,
   createTaskResumeInfoHook,
   createStartWorkHook,
   createPrometheusMdOnlyHook,
@@ -60,6 +61,7 @@ export type SessionHooks = {
   taskResumeInfo: ReturnType<typeof createTaskResumeInfoHook> | null
   anthropicEffort: ReturnType<typeof createAnthropicEffortHook> | null
   runtimeFallback: ReturnType<typeof createRuntimeFallbackHook> | null
+  delegateTaskEnglishDirective: ReturnType<typeof createDelegateTaskEnglishDirectiveHook> | null
 }
 
 export function createSessionHooks(args: {
@@ -215,6 +217,10 @@ export function createSessionHooks(args: {
     ? safeHook("delegate-task-retry", () => createDelegateTaskRetryHook(ctx))
     : null
 
+  const delegateTaskEnglishDirective = isHookEnabled("delegate-task-english-directive")
+    ? safeHook("delegate-task-english-directive", () => createDelegateTaskEnglishDirectiveHook())
+    : null
+
   const startWork = isHookEnabled("start-work")
     ? safeHook("start-work", () => createStartWorkHook(ctx))
     : null
@@ -276,6 +282,7 @@ export function createSessionHooks(args: {
     ralphLoop,
     editErrorRecovery,
     delegateTaskRetry,
+    delegateTaskEnglishDirective,
     startWork,
     prometheusMdOnly,
     sisyphusJuniorNotepad,