fix source map error and added tool-versions

[jonmajorc]

Fixed source map error in post-test script and added .tool-versions and engines key in package.json so ideally we are in sync with what tools are being used in CI

[Copilot]

🟢 Ready to approve

The changes are small, consistent with the stated goal, and the updated sourcemap parsing logic addresses the reported failure mode without introducing new risk.

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Pull request overview

This PR improves the reliability of the post-test source map verification step and adds explicit tool/runtime version metadata to better align local development with CI expectations.

Changes:

• Hardened scripts/check-sourcemaps.mjs to tolerate non-JSON preamble output from npm pack --json before parsing the report.
• Added Node/NPM engines constraints in package.json.
• Added .tool-versions to pin the Node.js version used by local tool managers (e.g., asdf).

File summaries

File	Description
scripts/check-sourcemaps.mjs	Makes npm pack JSON parsing resilient to extra stdout content so the sourcemap check doesn’t fail spuriously.
README.md	Updates all-contributors badge count and adds a contributor entry.
package.json	Declares expected Node/NPM versions via engines to align with CI runtime.
.tool-versions	Pins Node.js version for local toolchain synchronization.

Review details

• Files reviewed: 4/4 changed files
• Comments generated: 0
• Review effort level: Lite

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