Add TODO.md with prioritised backlog

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

TODO.md

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+# RQ3 Story Tool — To-Do
+
+## High priority (mechanics gaps)
+
+- [ ] Call `resolveHeadInjury()` in the attack handler when a Head hit penetrates armor
+- [ ] Resolve stuck-weapon follow-up after impale/slash special hits (`attemptWeaponRemoval`, `removeStuckWeaponFromSelf`, `removeStuckWeaponWithFirstAid`)
+
+## Medium priority (missing features)
+
+- [ ] Build strike-rank round scheduling UI (round counter, Next Round button, SR-ordered action display using `buildStrikeRankSchedule`)
+- [ ] Add API routes and UI for the experience/improvement system (`markWeaponExperienceChecked`, `updateWeaponSkillPercent`, `applyImprovement`)
+
+## Low priority (polish)
+
+- [ ] Wire up the export reminder modal (show on `beforeunload`, hook up Export Now / Leave Anyway / Cancel buttons)
+- [ ] Add `DELETE /api/spell-mappings/:id` endpoint and a spell mapping management UI
+- [ ] Add weapon and spell editing forms to NPC stat block view (currently only available for enemies)
+
+## Correctness fixes
+
+- [ ] Fix `rollOnTable` to roll the table's actual dice notation and match the range, instead of picking a flat random row index
+- [ ] Fix `state.dirty` being set to `true` on GET requests
+
+## Cleanup
+
+- [ ] Remove dead `state.reactionType` from frontend state