Add first sequential asset expansion batch

docs/asset-backlog.md

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+# Asset Backlog
+
+This backlog tracks sequential visual asset expansion for story images, portraits,
+and unit sheets. Counts are refreshed at the start of each batch, then the batch is
+generated, connected, validated, built, flow-tested, committed, and pushed.
+
+## Current Baseline
+
+- Story images: 44 files after Batch 1.
+- Portraits: 18 files after Batch 1.
+- Unit sheets: 106 files, 53 complete base/action design pairs after Batch 1.
+- Target direction:
+  - Story: about 5 images per major campaign chapter across 65 campaign stages.
+  - Portraits: one portrait for every important `scenario.ts` speaker.
+  - Units: 100+ complete unit designs, each with a base 4x4 sheet and an actions 4x4 sheet.
+
+## Batch 1 Priority
+
+Status: complete and ready for build/flow verification.
+
+The first batch targets the most repeated story backgrounds and the highest-frequency
+missing portrait speakers.
+
+### Story
+
+- `37-yizhou-luo-road-ambush.png`
+- `38-yizhou-luo-road-supply-train.png`
+- `39-nanzhong-captures-jungle-net.png`
+- `40-nanzhong-captures-river-ford.png`
+- `41-wandering-night-camp.png`
+- `42-wandering-river-crossing.png`
+- `43-northern-qishan-snow-march.png`
+- `44-northern-wei-fortress.png`
+
+### Portraits
+
+- `fa-zheng.png`
+- `jian-yong.png`
+- `pang-tong.png`
+- `mi-zhu.png`
+- `zhou-yu.png`
+- `yi-ji.png`
+- `yan-yan.png`
+
+### Units
+
+- `unit-wei-archer-veteran.png` + `unit-wei-archer-veteran-actions.png`
+- `unit-wu-cavalry-elite.png` + `unit-wu-cavalry-elite-actions.png`
+- `unit-nanman-shaman-ember.png` + `unit-nanman-shaman-ember-actions.png`
+
+## Next Backlog Pool
+
+- Story variants: `story-yizhou`, `story-jingzhou-crisis`,
+  `story-fan-castle-flood`, `story-jieting-crisis`, `story-chengdu-surrender`,
+  `story-anti-dong`.
+- Portraits: `wu-yi.png`, `li-yan.png`, `ma-chao.png`, `gong-zhi.png`,
+  `huang-zhong.png`, `cao-cao.png`, `wei-yan.png`, `ma-dai.png`, `meng-huo.png`.
+- Units: faction/class variants for Shu, Wei, Wu, Nanman, rebel remnants, and
+  named-general alternates until the complete design count reaches 100+.