docs: TODO reflects today's sessions/analysis work

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TqXevQJhxFrM7jJg82cgZN

docs/TODO.md

@@ -3,7 +3,7 @@
 Everything requested and not yet delivered. Ordered roughly by dependency, not
 priority — say which to take and I'll reorder.
 
-Updated 2026-09-11.
+Updated 2026-09-11 (evening).
 
 ---
 
@@ -189,10 +189,13 @@ Captured so nothing is lost while the article writing runs.
 
 ## Analysis
 
-- [ ] **Per-question performance table** — number, stem excerpt, difficulty, time
-      per question, percentile; sortable, paginated.
-- [ ] **Session analysis tab** — per-session results with study recommendations
-      grouped by Articles / Disciplines / Systems.
+- [x] **Per-question performance table** — done 2026-09-11 on the session
+      analysis: position, excerpt, difficulty, time, peer percentage; sortable
+      by position / slowest / hardest, ten a page.
+- [x] **Session analysis** — done 2026-09-11. Sessions and analysis are one page:
+      `/sessions` is the overall picture, `/sessions/:attemptId` one session, the
+      sidebar lists every session. Recommendations grouped by Articles /
+      Disciplines / Systems remain open (see Reading and study).
 
 ## Dashboard