Add eighth sequential asset expansion batch

docs/asset-backlog.md

@@ -6,9 +6,9 @@ generated, connected, validated, built, flow-tested, committed, and pushed.
 
 ## Current Baseline
 
-- Story images: 96 files after Batch 7.
-- Portraits: 49 files after Batch 7.
-- Unit sheets: 148 files, 74 complete base/action design pairs after Batch 7.
+- Story images: 104 files after Batch 8.
+- Portraits: 54 files after Batch 8.
+- Unit sheets: 154 files, 77 complete base/action design pairs after Batch 8.
 - Target direction:
   - Story: about 5 images per major campaign chapter across 65 campaign stages.
   - Portraits: one portrait for every important `scenario.ts` speaker.
@@ -269,3 +269,37 @@ toward the 100+ complete-pair target.
 - `unit-wei-infantry-shield.png` + `unit-wei-infantry-shield-actions.png`
 - `unit-wu-archer-naval.png` + `unit-wu-archer-naval-actions.png`
 - `unit-nanman-officer-bronze.png` + `unit-nanman-officer-bronze-actions.png`
+
+## Batch 8 Priority
+
+Status: complete. Visual contact sheets, image dimensions, unit base/action pairs,
+auto-connection checks, `pnpm build`, and `pnpm verify:flow` passed.
+
+This batch raises several still-thin high-repeat story keys to three or more
+variants, adds campaign portrait variants for important mid/late-campaign
+officers, and adds unit variants for Shu cavalry, Wei cavalry, and Wu strategists.
+
+### Story
+
+- `97-fan-castle-flood-prison-camp.png`
+- `98-jingzhou-crisis-secret-letter.png`
+- `99-xuzhou-flooded-courtyard.png`
+- `100-jieting-crisis-wooden-palisade.png`
+- `101-chengdu-surrender-river-gate.png`
+- `102-yiling-baidi-lantern-vigil.png`
+- `103-weishui-northbank-frozen-ferry.png`
+- `104-lucheng-pursuit-dust-road.png`
+
+### Portraits
+
+- `zhou-yu-campaign.png`
+- `wei-yan-campaign.png`
+- `ma-dai-campaign.png`
+- `li-yan-campaign.png`
+- `huang-quan-campaign.png`
+
+### Units
+
+- `unit-wei-cavalry-elite.png` + `unit-wei-cavalry-elite-actions.png`
+- `unit-wu-strategist-fire.png` + `unit-wu-strategist-fire-actions.png`
+- `unit-shu-cavalry-scout.png` + `unit-shu-cavalry-scout-actions.png`