diff --git a/TODO.md b/TODO.md
index 239e0b4..278e9e3 100644
--- a/TODO.md
+++ b/TODO.md
@@ -14,6 +14,23 @@ REWORK_PLAN.md.
   format for new entries.
 - Related: BUG-7 (reorder no undo).
 
+## Architecture: 1-list turn order model (DONE)
+- Single source: turnOrderIds === participants.map(id). No re-sort after
+  startEncounter. nextTurn skips inactive (predicate), inactive stay in slot.
+- Drag (reorder) overrides initiative — cross-init allowed, DM choice.
+- startEncounter sorts ALL participants by init once, then frozen.
+- addParticipant splices by init pos. remove/toggle/reorder sync list.
+- Display renders participants[] directly (no sortParticipantsByInitiative).
+- BUG-6 (reorder divergence) fixed structurally. BUG-5 (rotation) held
+  (500 rounds CLEAN).
+
+### FEAT-3: initiative first-class entry (add + edit)
+- Current: only initMod at char-build. No initiative field at add-participant
+  or edit. 3-step to set after other steps.
+- Need: initiative field at add-char, add-monster, AND edit participant.
+- Separate design + RED. Own work item.
+- Related: tie-break = drag order (current, works). Expose clearly.
+
 ### FEAT-1: Dead participants stay in turn order — DONE
 - Fixed: `applyHpChange` no longer flips `isActive` or touches `turnOrderIds`
   on death/revive. Dead stay in rotation, `nextTurn` visits them, PCs get
@@ -92,7 +109,10 @@ REWORK_PLAN.md.
   `nextActiveAfter`. Both nextTurn + computeTurnOrderAfterRemoval delegate.
 - 500-round replay: 0 skips, 0 double-acts.
 
-### BUG-6: reorderParticipants doesn't update turnOrderIds
+### BUG-6: reorderParticipants doesn't update turnOrderIds — FIXED
+- Fixed structurally by 1-list model (commit 5d3a060). turnOrderIds =
+  participants.map(id) always. reorder cross-init allowed (DM override).
+  Display === rotation by construction.
 - Test: `shared/tests/turn.reorder.test.js` 'reorder updates turnOrderIds' (RED).
 - `reorderParticipants(enc, draggedId, targetId)` swaps two same-initiative
   participants in `participants[]` array but leaves `turnOrderIds` unchanged.
@@ -134,8 +154,8 @@ REWORK_PLAN.md.
 
 ## Pipeline (bugs only --- milestones live in REWORK_PLAN.md)
 - [ ] BUG-4: fix setDoc→updateDoc for all 5 activeDisplay sites
-- [x] BUG-5: fixed (commit 494327f)
-- [ ] BUG-6: reorderParticipants update turnOrderIds
+- [x] BUG-5: fixed (1-list model, 500 rounds clean)
+- [x] BUG-6: fixed structurally (1-list model)
 - [ ] BUG-8: ws adapter reconnect
 - [ ] BUG-10: deact+reactivate double-act
 - [ ] BUG-11: FE Combat.scenario crash