feat: full feature buildout — streaming, i18n, mastery map, admin, jobs

Progressive lesson streaming via onSegment callback (fixes SSE for non-English
users — locale was shadowed in lesson-reader useEffect). Adds: BullMQ workers,
Redis stream buffer, token budget enforcement, Langfuse tracing, golden-eval
runner, Playwright e2e scaffolding, lesson depth/locale/preferences schema,
mastery map UI, admin panel (blueprints/users/reports/quality/misconceptions),
image queries, source citations, view transitions, reading animations, i18n
(next-intl), PDF export, surprise endpoint, and 402 passing unit tests.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

jobs/index.ts

@@ -1,13 +1,15 @@
 import generateLessonWorker from './generate-lesson-job';
 import promoteBlueprintWorker from './promote-blueprint-job';
+import regenerateBlueprintWorker from './regenerate-blueprint-job';
 
-console.log('[workers] Running: generate-lesson, promote-blueprint');
+console.log('[workers] Running: generate-lesson, promote-blueprint, regenerate-blueprint');
 
 async function shutdown(signal: string) {
   console.log(`[workers] ${signal} received — draining and closing workers...`);
   await Promise.all([
     generateLessonWorker.close(),
     promoteBlueprintWorker.close(),
+    regenerateBlueprintWorker.close(),
   ]);
   console.log('[workers] Shutdown complete.');
   process.exit(0);