[seveibar]

Finite bends on separate PCB arms are currently rejected whenever their moving directions differ. Allow independent regions to fold about different axes, and allow a nested fold to move with its parent's rigid distal region. This supports both the two outward arms and the original body-moving arrangement from tscircuit#5277.

Derive fold order from finite moving-region containment: fold children first, then carry them with their parents. A nested region must lie entirely beyond its parent's curved strip. Edge-aware polygon containment handles concave outlines. Partially overlapping regions, equal regions, and intersecting curved strips still return typed folding errors. Calls without a board outline retain the parallel, same-moving-direction requirement.

The existing point, direction, inverse CAD, surface, and rigid-mesh transforms are reused. Geometry does not depend on record order, endpoint direction, or outline winding. The original fixture's vertical bend_side: "left" deliberately moves the main body; its snapshot preserves that direction and shows the right tip staying fixed.

Validation: all 32 tests pass (2,029 assertions), including existing visual baselines, parallel serial folds, opposite moving directions, negative angles, rigid forward/inverse transforms, incompatible intersections, and concave containment. TypeScript, build, formatting, and diff checks pass. Three new PNG snapshots use the existing toMatchPngSnapshot/PoppyGL conventions and were visually inspected. No README changes.

Independent arms:

Original body-moving arrangement:

Full GitHub CI passes for the source commit, including tests, typecheck, and build. Downstream consumer PRs use immutable built preview dbe07e49220c40ec3f0109b7d566561ce5e58bc9 until this helper is merged and released.

[tscircuitbot]

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PR Rating: ⭐⭐⭐
Impact: Major

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