inputs_mut, inputs and expressions are now built on one exhaustive walk (walk_exprs / walk_exprs_mut) instead of two hand-written matches over FeatureKind. inputs() no longer clones the feature, plane chains are walked with the same nesting cap for inputs as for expressions, and a new variant without a walk arm does not compile. A golden record of every variant's expressions guards the walk.
A construction plane built from model geometry resolves each of its sides
through the document again. That hop restarted the recursion depth at 0, so a
plane that is its own side never exceeded depth 1 and the 32-level cap never
fired: a ~600-byte design file recursed until the stack overflowed and the
process aborted, which no panic guard can intercept.
Carry the depth on the construction context so the geometry arms continue the
caller's count instead of restarting it.
Fixes#143
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
(cherry picked from commit 4bca1d49f27dfe9ef0140132746e1c7415daba8e)
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