Add support for Label-kind categories to handle high-cardinality
per-row fields like descriptions, IDs, and notes. These fields are
stored alongside regular categories but default to Axis::None and
are excluded from pivot category limits.
Changes:
- analyzer.rs: Label fields now default to accepted=true
- wizard.rs: Collect and process label fields during model building,
attaching label values as coordinates for each cell
- category.rs: Add Label variant to CategoryKind enum
- types.rs: Add add_label_category() method and update category
counting to only include Regular-kind categories
Co-Authored-By: fiddlerwoaroof/git-smart-commit (unsloth/Qwen3.5-35B-A3B-GGUF:Q5_K_M)
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