ci: test Node SDK across versions + platforms

[pratyush618]

What

Bring the Node SDK CI up to the same cross-version / cross-platform coverage as the Java (#309) and Python suites. It previously ran on one Node (22) and one platform (linux-x64) while npm ships 7 platform binaries.

Why this shape

Node-API is ABI-stable — one .node binary runs every Node major without recompilation (Node-API docs, napi-rs). So the addon is built once on Linux and reused across the Node version matrix; only the platform legs (different binary) rebuild. Same build-once/fan-out pattern as #309.

Jobs

• build (linux-x64): build addon + TypeScript + dashboard SPA, run typecheck + biome lint, upload native/ + static/ as an artifact.
• test matrix Node [18, 20, 22]: download the prebuilt addon, pnpm test. No Rust toolchain, no rebuild. fail-fast: false.
• smoke [macos-15, windows-latest] on Node 22: rebuild the platform-specific addon + dashboard, run the suite. Windows points OPENSSL_SRC_PERL at Strawberry Perl for the vendored OpenSSL build.

setup-node gains a node-version input (default 22, non-breaking) so the matrix can select the runtime.

Verification

• Full suite (44 files / 183 tests) runs green against a prebuilt native/ + static/dashboard with no rebuild — confirms the reuse path the version matrix depends on (dashboard tests read static/dashboard, so it's shared in the artifact).
• YAML validated.

Notes

• Coverage now: linux-x64 × Node 18/20/22 + macOS arm64 + Windows x64. The musl + linux-arm64 + macOS-x64 binaries stay publish-only (built in publish-node.yml), matching how the other SDKs scope CI.
• Branch protection: new checks Node / Build + Lint (linux-x64), Node / Node SDK Tests (Node 18|20|22 / linux-x64), Node / Node SDK Smoke (macos-15|windows-latest) — old Node / Node SDK Tests goes away.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 281fe8e5-5ba9-4853-97f1-196fb5c0cba2

📥 Commits

Reviewing files that changed from the base of the PR and between cbb3aac and fe90ea6.

📒 Files selected for processing (4)

• .github/actions/setup-node/action.yml
• .github/workflows/ci-node.yml
• sdks/node/package.json
• sdks/node/tsup.config.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/node-matrix

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[pratyush618]

Node 18 leg failed: vitest 4 imports util.styleText (Node 20.12+), so the suite can't run on 18. Node 18 is EOL (Apr 2025). Raised the floor to Node 20 (engines >=20, tsup target: node20) and set the matrix to 20 / 22 / 24. Verified locally on Node 24 (44 files / 183 tests green).