feat(hooks): add sisyphus-gpt-hephaestus-reminder hook

Shows error toast when Sisyphus runs with a GPT model, nudging user to
use Hephaestus instead.

🤖 Generated with [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

src/plugin/chat-message.ts

@@ -81,6 +81,7 @@ export function createChatMessageHandler(args: {
     await hooks.keywordDetector?.["chat.message"]?.(input, output)
     await hooks.claudeCodeHooks?.["chat.message"]?.(input, output)
     await hooks.autoSlashCommand?.["chat.message"]?.(input, output)
+    await hooks.sisyphusGptHephaestusReminder?.["chat.message"]?.(input)
     if (hooks.startWork && isStartWorkHookOutput(output)) {
       await hooks.startWork["chat.message"]?.(input, output)
     }

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

@@ -20,6 +20,7 @@ import {
   createStartWorkHook,
   createPrometheusMdOnlyHook,
   createSisyphusJuniorNotepadHook,
+  createSisyphusGptHephaestusReminderHook,
   createQuestionLabelTruncatorHook,
   createPreemptiveCompactionHook,
 } from "../../hooks"
@@ -50,6 +51,7 @@ export type SessionHooks = {
   startWork: ReturnType<typeof createStartWorkHook> | null
   prometheusMdOnly: ReturnType<typeof createPrometheusMdOnlyHook> | null
   sisyphusJuniorNotepad: ReturnType<typeof createSisyphusJuniorNotepadHook> | null
+  sisyphusGptHephaestusReminder: ReturnType<typeof createSisyphusGptHephaestusReminderHook> | null
   questionLabelTruncator: ReturnType<typeof createQuestionLabelTruncatorHook>
   taskResumeInfo: ReturnType<typeof createTaskResumeInfoHook>
   anthropicEffort: ReturnType<typeof createAnthropicEffortHook> | null
@@ -156,6 +158,10 @@ export function createSessionHooks(args: {
     ? safeHook("sisyphus-junior-notepad", () => createSisyphusJuniorNotepadHook(ctx))
     : null
 
+  const sisyphusGptHephaestusReminder = isHookEnabled("sisyphus-gpt-hephaestus-reminder")
+    ? safeHook("sisyphus-gpt-hephaestus-reminder", () => createSisyphusGptHephaestusReminderHook(ctx))
+    : null
+
   const questionLabelTruncator = createQuestionLabelTruncatorHook()
   const taskResumeInfo = createTaskResumeInfoHook()
 
@@ -181,6 +187,7 @@ export function createSessionHooks(args: {
     startWork,
     prometheusMdOnly,
     sisyphusJuniorNotepad,
+    sisyphusGptHephaestusReminder,
     questionLabelTruncator,
     taskResumeInfo,
     anthropicEffort,