facet-rs / facet / 20100700279

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fix: handle transparent structs in untagged enum variant resolution

When the solver analyzes untagged enum variants for field matching, it
now properly unwraps transparent wrappers and proxy types to find the
actual fields that appear in the serialized format.

Previously, a variant like `Linear(Curve64)` where `Curve64` is a
transparent wrapper around `GCurve<f64, f64>` (which uses a proxy
`GCurveProxy<f64, f64>`) would fail to match JSON like
`{"x":[0.0,1.0],"y":[0.22,0.25]}` because the solver only saw the
transparent struct's single tuple field, not the proxy's x/y fields.

The fix adds `unwrap_to_effective_shape()` which recursively unwraps:
1. Transparent wrappers (shape.inner)
2. Proxy types (shape.proxy)

This ensures the solver sees the actual fields used for serialization.

Fixes #1191

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