feat: add bundled OpenCode skills and refine module flow

electron/opencode/course-skills.ts

@@ -7,6 +7,7 @@ import {
   unlinkSync,
 } from 'node:fs';
 import { join } from 'node:path';
+import { BUNDLED_OPENCODE_SKILL_IDS } from '../../shared/opencode-skills';
 
 export interface BundledSkillsPathInput {
   isPackaged: boolean;
@@ -19,9 +20,7 @@ export interface EnsureBundledCourseSkillsOptions {
   sourceDir?: string;
 }
 
-export const BUNDLED_COURSE_SKILL_IDS = [
-  'agent-browser',
-] as const;
+export const BUNDLED_COURSE_SKILL_IDS = BUNDLED_OPENCODE_SKILL_IDS;
 const RETIRED_COURSE_SKILL_IDS = [
   'course-stage-review',
   'student-growth-logger',