feat: support multiple Node.js versions

[SiegeSailor]

Summary

Support multiple Node.js versions by adding tests, updating pipelines, and using different dependencies' versions.

Important Details

• Issue(s) Closed: Closes Support Multiple Node.js Versions #12

Checklist

• Use Conventional Commits format for the PR title
• Read and follow CONTRIBUTING.md
• Link to at least one related issue (create one if none exist)

[Copilot]

Pull request overview

Adds multi-version Node.js compatibility support across the CLI/library by updating runtime requirements, CI coverage, and introducing an automated CLI smoke suite to validate behavior across Node versions.

Changes:

• Expand GitHub Actions test workflow to run on a Node.js version matrix and split compat vs coverage runs.
• Introduce a CLI smoke test script and wire it into npm test / test:compat.
• Update CLI prompt flows to support non-interactive operation via IPromptOptions and adjust dependency/engine constraints accordingly.

Reviewed changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
source/shared/cli/utilities.ts	Adds non-interactive support to inquire.continue via promptOptions.
source/key-encryptions/RSA.ts	Threads IPromptOptions into demo flow steps to support non-interactive runs.
source/key-encryptions/ElGamal.ts	Same as above for ElGamal demo flow.
source/key-encryptions/DiffieHellman.ts	Same as above for Diffie-Hellman demo flow.
scripts/test-cli.js	Adds automated smoke coverage for algorithms and demonstrations via runCLI.
package.json	Adjusts dependencies/engines and adds test:cli / test:compat scripts.
README.md	Updates documented Node/NPM requirements and tested Node versions.
CONTRIBUTING.md	Updates development requirements and script documentation.
.nvmrc	Sets default dev Node version to 14.18.0.
.npmrc	Disables engine-strict for installs.
.github/workflows/test.yml	Runs CI tests across multiple Node versions and gates coverage to one version.

Comments suppressed due to low confidence (1)

.github/workflows/test.yml:35

• actions/checkout@v6 is not a valid released major version of the checkout action (current stable majors are lower). This will cause the workflow to fail to resolve the action. Use an existing major (e.g., actions/checkout@v4).

      - name: Action | Checkout Repository Code
        uses: actions/checkout@v6

[github-actions]

🎉 This PR is included in version 2.3.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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