[shunichironomura]

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Summary

Companion to graphcal-lang/tree-sitter-graphcal#80 and graphcal-lang/zed-graphcal#39.

• Add a plots-keyword TextMate rule, next to mark-keyword / encode-keyword, that scopes plots as keyword.other.plots.graphcal in plots: [name, ...] fields of figure and layer declarations.
• Like mark / encode, the rule is context-free in TextMate; it engages only when plots: is followed by a [ list, so param plots: Length, plots + 1, and subplots: [...] are not highlighted.
• Add tests/plots.test.mjs covering positive and negative cases.

Validation

• vp test: 2 test files, 2 tests pass.
• vp check: formatting, lint, and type checks pass.

AI assistance

• AI used: yes — TextMate rule, test, and validation.
• Human review of AI-assisted code: pending.

Breaking changes

• No breaking changes
• Breaking changes; the breaking change label is applied