feat: make SuperPaper the family parent of superfig and supertensor

House the two figure toolkits as git submodules under SuperPaper.
The parent owns paper-note orchestration; children keep their own
history, macros, and lint. DESIGN.md is the family contract.

README.md

@@ -0,0 +1,50 @@
+# SuperPaper
+
+母仓库：把一篇论文编成带 ledger 的中文讲义，并把图路由到独立的子仓库。
+
+子仓库各自保有自己的 git 历史、lint 和不变量。母仓库只编排，不往任何一个 `.sty` 里塞笔记宏。
+
+```
+superpaper/                 this repo (orchestration)
+├── DESIGN.md               family spec
+├── SKILL.md                document-layer skill
+├── superfig/               submodule — architecture / pipeline / flow
+├── supertensor/            submodule — tensor faces / axes / shards
+└── superderive/            later — stepwise rewrite figures
+```
+
+| 子仓库 | 画什么 | 远程 |
+|---|---|---|
+| [`superfig`](superfig/) | 节点、边、分组、机制框图 | `carrydela/SuperFig` |
+| [`supertensor`](supertensor/) | 形状对齐的张量公式图 | `carrydela/SuperTensor` |
+| `superderive` | 逐步代数改写图 | 尚未建 |
+
+## Clone
+
+```bash
+git clone --recurse-submodules \
+  ssh://git@ssh.gitea.mygoband.com:2222/carrydela/SuperPaper.git
+# 已有工作副本：
+git submodule update --init --recursive
+```
+
+Each child is also a standalone skill. Point an agent at `superfig/` or
+`supertensor/` when you only need that figure grammar. Point at this
+directory when the job is 读论文 / 脉络 / 推导 / 出图路由.
+
+## Layout on disk
+
+Under `/home/carry/myprj/tools/skills/` the old sibling paths are
+symlinks into this repo:
+
+```
+skills/superpaper/           SuperPaper
+skills/superfig           -> superpaper/superfig
+skills/supertensor        -> superpaper/supertensor
+```
+
+## Status
+
+The family contract lives in [`DESIGN.md`](DESIGN.md). Figure children
+are usable now. The notes scaffold (`scripts/`, ledger, template) is
+the SuperPaper v1 PR chain in that document — not in this commit.