fix: strip disallowed properties from secondary encoding channels#169

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cpsievert wants to merge 2 commits intoposit-dev:mainfrom

cpsievert:fix/vegalite-secondary-channel-encoding

Commits on Mar 4, 2026

fix: strip disallowed properties from secondary encoding channels (x2, y2)

cpsievert
and
claude
committed

Commits on Mar 6, 2026

refactor: move secondary channel handling to vegalite writer

cpsievert
and
claude
committed