supertensor: shape-aware tensor figure toolkit

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Extracted from the tensor-formula-viz skill and rebuilt around the idea that
the geometry rules should be enforced by construction rather than restated as
prose an agent has to remember.

- assets/supertensor.sty: faces, stacks, index faces, shared caption lanes,
  meaning box, signature. Macros take a declared axis and a declared role, so
  equal shapes get equal edges, a x a is square, a transpose swaps the face,
  and contracted axes share an edge length -- without any manual alignment.
- scripts/preflight.sh: decide the TikZ/CJK path before drawing.
- scripts/build.sh: compile and fail on silent corruption (missing CJK glyphs,
  overfull boxes, undeclared roles), then export pdf/svg/png/thumb.
- scripts/test.sh: build every figure as a regression test for the package.
- examples/: three golden figures (TP-FFN, causal MHA, MoE top-k gather) plus
  an anti-pattern gallery of figures that compile cleanly and still lie.
- SKILL.md + references/: lean entry point, details loaded on demand.

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