fix(writer): boxplot produces invalid Vega-Lite spec#449
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Skip the boxplot stat's internal "type" aesthetic when building Vega-Lite encoding channels and strip the y2 encoding on whisker/box layers down to just the field reference. Add a schema-validated boxplot test. Closes posit-dev#448
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Summary
"type"aesthetic when building Vega-Lite encoding channels — it's structural (consumed during data preparation), not a visual channel.y2encoding on whisker/box layers down to just{"field": ...}— secondary position channels don't acceptaxis,scale,type, orstack.test_geom_boxplotonly checked\!json.is_empty()).Closes #448
Test plan
test_boxplot_schema_validationvalidates output against VL v6 JSON Schema