build(deps-dev): upgrade vitest to v5

[claude]

This moves the test suite to Vitest 5 (vitest and @vitest/coverage-v8 to ^5.0.1). Vitest 5 needs Node 22.12+, so the engines floor goes from 22 to 22.12.0 and the CI, check-dist and lint workflows now run on Node 24, which also matches the action's node24 runtime. Vite is now a required peer of Vitest rather than a transitive dependency, so it is added as a devDependency at ^8.3.0, reusing the 8.3.0 already in the lockfile. @types/node goes from ^20 to ^24 to line up with the runtime and with Vite's peer range; that bump needed no source changes. No tests or config used APIs Vitest 5 removed, there are no snapshots, and the rebuilt dist/ is unchanged. Install, format check, lint, typecheck, tests with coverage, and the dist comparison all pass locally.

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https://claude.ai/code/session_01N2vvE5XzurMvQfsX7Vz7bF

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​vitest/​coverage-v8@​4.0.5 ⏵ 5.0.3			+11	+2
	vitest@​4.1.11 ⏵ 5.0.3			+1	+1
	@​types/​node@​20.19.23 ⏵ 24.19.0			+1	+1
	vite@​8.3.0

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[dsanders11]

@claude, lets create a .nvmrc file here in the repo and point CI to it.

[claude]

Added .nvmrc (Node 24) and switched the CI, check-dist and lint workflows to node-version-file: .nvmrc in cb172a6.

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