Initial commit: Learning Lab Express

Includes fixes found while reviewing the app:
- Results: open each result by a type+agent+id key, so a video and a
  material draft with the same id no longer open each other's popup
- AuthGate: clear the query cache during render, before pages build their
  queries, and remount pages on organization switch (pages no longer stay
  on skeletons for up to a minute after sign-in or refresh)
- Instruction: keep only failed rules after a partial approve, so retrying
  does not create the successful schedules twice; drop the monthly note
  once count or frequency is edited
- Parser/schedules: never schedule a count below one
- Audio: ignore the end event of a cancelled utterance when changing speed
- Downloads: revoke the object URL later so Safari/Firefox can read it
- Results: refetch SCORM content when any part's revision changes; show a
  failed video as failed instead of "still rendering"

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

prototype/README.md

@@ -0,0 +1,27 @@
+# Learning Lab Express
+
+UI fase development (`index.html`, satu file, tanpa dependensi) dengan desain yang sama dengan `mockup.html` (CSS dipakai apa adanya) tetapi isi/alurnya memakai data engine yang terhubung ke engine **learning-lab** (FastAPI, `/api/v1`).
+
+```bash
+# 1. jalankan engine di ../learning-lab (docker compose up) → http://localhost:8000
+# 2. jalankan Express
+node server.mjs          # http://localhost:3000 ; ENGINE_URL / PORT dapat diubah
+```
+
+`server.mjs` menyajikan file statis dan mem-proxy `/api/*` ke engine (tanpa CORS).
+`engine.js` adalah client engine.
+
+| Alur | Engine |
+|---|---|
+| Login / logout / refresh token | `/auth/login`, `/auth/refresh`, `/auth/logout` |
+| Upload materi → Brain | `/upload/`, `/upload/list`, `DELETE /upload/{id}` |
+| Knowledge base (Brain) | `/upload/{id}/knowledge/build` (memakai kredit workspace) |
+| Login Clerk (akun organisasi) | `clerk-js` dari instance Clerk milik engine (key dibaca dari `../learning-lab/backend/.env`, atau `CLERK_PUBLISHABLE_KEY`) |
+| Riset konten | agen "Learning Lab Express" di `/organizations/current/agents` → `runs` → `source-drafts` |
+| Jadwal riset | `PATCH agents/{id}` `run_schedule` (harian/mingguan; bulanan & hari kerja dijalankan harian) |
+| Generate Text | `/compose/sets` + `/compose/sets/{id}/generate/summary` |
+
+Agents API hanya berjalan dalam konteks organisasi, jadi riset dan jadwal memerlukan tombol **Masuk dengan Clerk** dengan akun yang menjadi owner organisasi. Dengan login email/password biasa, riset tetap simulasi.
+Agen dibuat otomatis (budget 50 kredit/run, 1000/bulan; ubah di `Engine.ensureAgent`).
+
+Belum ada: video, audio, dan SCORM. Hanya format yang didukung engine yang bisa diunggah.