Modernize SigPlot build, test, and CI tooling#18

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mrecachinas wants to merge 21 commits intospectriclabs:mainfrom

mrecachinas:modernize/build-tooling

Commits on Mar 8, 2026

build: modernize tooling — esbuild, ESLint 9, Prettier, GitHub Actions

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build: add Vite dev server and Vitest test runner

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ci: enable test job now that Vitest is configured

mrecachinas
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refactor: convert all source files from CommonJS IIFE to ES modules

mrecachinas
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build: remove Grunt, Karma, and all legacy tooling

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test: migrate QUnit unit tests to Vitest API

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chore: remove migrated QUnit test files and HTML runners

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Commits on Mar 9, 2026