facet-rs / facet / 20027949436

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fix(facet-yaml): implement untagged enum deserialization

Add support for deserializing untagged enums in facet-yaml, fixing #1183.

The implementation uses the same Solver-based approach as facet-json:
- Two-pass algorithm for struct variants (mappings)
- Pass 1: Collect all keys and feed to Solver to determine variant
- Pass 2: Rewind and deserialize the selected variant

Key optimizations:
- Zero-copy key collection via event indices (avoids String clones)
- Direct references to event strings when feeding Solver

Current limitations:
- Tuple variants as YAML sequences not yet supported
- Scalar variants (newtype/unit as scalars) not yet supported
- Users should use struct variants for untagged enums in YAML

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