chore(ci): upgrade node to 22 lts (test on 22 and 24)

[joshuaellis]

Node 18 (EOL April 2025) and Node 20 (out of maintenance April 2026) are unsupported upstream. This brings CI onto supported LTS lines and declares the floor in the root package.json.

Changes

• Matrix jobs (Build, Test:unit, Test:types, Test:E2E) now run on 22.x and 24.x
• publish-ci and are-the-types-wrong matrices moved from 18.x to 22.x
• Pinned workflows (nightly, checks, bundle-size, experimental) read Node from .nvmrc instead of hard-coding 20
• .nvmrc refreshed to 22.22.3 (latest 22.x patch)
• Root package.json declares "engines": { "node": ">=22" }. Scoped to root only — published packages under packages/* and targets/* are untouched, so library consumers see no change.

Notes

• engines is intentionally root-only. If we want to declare a floor for consumers in future, that's a separate SemVer-relevant call.
• Locally verified on Node 24: pnpm install --frozen-lockfile, pnpm build-ci, pnpm test, pnpm docs:build all clean.

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