feat(pdftract-zy2jx): generate JSON Schema from Rust output types
- Add schemars dependency to pdftract-core (v1.2)
- Add JsonSchema derives to output types (ExtractionResult, PageResult, ExtractionMetadata, SpanJson, BlockJson, CellJson, RowJson, TableJson, ExtractionQuality, Receipt, ReceiptsMode)
- Create xtask/src/bin/gen_schema.rs for schema generation
- Add gen-schema command to xtask main.rs
- Generate docs/schema/v1.0/pdftract.schema.json using Draft 2020-12
Schema includes:
- $schema: "https://json-schema.org/draft/2020-12/schema"
- $defs with all output type definitions
- Proper type annotations for all fields
Closes: pdftract-zy2jx
92e90af0b0