Key schema definition traits by schema type

[adampetro]

What changed

• Add a SchemaDefinition association to each schema-owned definition trait.
• Remove associated types that duplicate members of the schema family.
• Key type, input type, and output type references by their schema definition.
• Make each schema own one canonical input type and one canonical output type.
• Keep alternate variable-definition traversal inside the validator with private, static-dispatch input views.
• Update parser, visibility, validator, schema comparator, and type generation code.

Why

The previous API repeated structural equality bounds across the definition traits. The new API makes SchemaDefinition the owner of the complete definition type family. This reduces generic bounds and prevents references from different schema families from being mixed.

The core input and output references now depend only on the schema definition. Validator-specific variable types no longer add representation parameters to the public core API.

Compatibility

This change updates public traits and reference types. It is a source-breaking change and needs a minor version release.

Validation

• cargo check --workspace --all-features
• cargo test --workspace --all-features
• cargo clippy --workspace --all-targets --all-features -- -D warnings
• cargo fmt --all -- --check
• git diff --check