Every helix-golf example is a differential case, one per step of its walkthrough

The ten examples on helix-golf are imported as 118 cases: each numbered step
of an example's walkthrough is the case whose keys are the command up to and
including that step, so the first mismatch names the step where pardes and
helix part. Six more restart at a step that begins with %, from helix's own
text there, so a later step is tested even when an earlier one misses.
zig build hxgolf compares all 124 with goldens from hx-harness.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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