Add transpiler extracting sketches to variable

[jtran]

Part of #10275.

Transform code like this

// comment
myVar = foo
  |> extrude(bar)
  |> baz

into

// comment
sketch1 = foo
myVar = extrude(sketch1, bar)
  |> baz

This has a problem of losing some comments. See public/sketch-solve-samples/t-slot-frame/main.kcl and friends.

Many files are deleted because we found more sketches, tried to transpile them, and they failed.

We also allow experimental features in files that have a sketch block.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
modeling-app	Ready	Preview, Comment	Mar 14, 2026 1:25am

[codspeed-hq]

Merging this PR will not alter performance

✅ 167 untouched benchmarks
⏩ 93 skipped benchmarks¹

---

_{Comparing jtran/name-sketches (2959c08) with main (517b27c)}

Footnotes

1. 93 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩