test: validate writer output against Vega-Lite v6 JSON Schema#175

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cpsievert wants to merge 12 commits intoposit-dev:mainfrom

cpsievert:feat/vegalite-schema-validation

Commits on Mar 6, 2026

chore: add jsonschema dev-dependency for schema validation

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chore: vendor Vega-Lite v6 JSON Schema

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feat: add assert_valid_vegalite() test helper with schema validation

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test: validate all writer specs against Vega-Lite v6 schema

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fix(vegalite): don't emit bin=\"binned\" for non-positional encodings

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style: fix rustfmt formatting in sanitize_vegalite_schema

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perf: only rewrite $ref strings when sanitizing VL schema

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refactor: extract VEGALITE_VERSION constant for schema URL

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test: verify vendored schema matches upstream on each test run

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chore: trim redundant comments

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refactor: use full URL constant VEGALITE_SCHEMA instead of version fragment

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refactor: use VEGALITE_SCHEMA constant directly in upstream check test

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