fix: align documented Node engine floor

[naufalfx805-source]

What does this PR do?

Aligns the project-level Node engine declaration and contributor docs with the locked dependency graph enforced by the repo's committed .npmrc\ (\engine-strict=true).

The previous >=20\ claim allowed Node 20.0-20.18, Node 21, and early Node 22 releases, but
pm ci\ can fail before contributors can build or test because locked dev dependencies require the intersection ^20.19.0 || ^22.13.0 || >=24.

This updates:

• root \package.json\ engine range
• root package entry in \package-lock.json\
• README badge, quickstart, and contributing copy
• CONTRIBUTING and DOCUMENTATION prerequisites

Related issue

Refs hackathon CLI improvement bonus.

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that changes existing behavior)
• Documentation only
• Build / CI / chore

Checklist

• PR targets the \main\ branch.
• Commits follow Conventional Commits.
• 
  pm run lint\ and
  pm run format:check\ pass.
• 
  pm run typecheck\ passes.
• 
  pm test\ passes and coverage stays at or above the 80% gate.
• New behavior is covered by unit tests (mock-based; no network or credentials required).
• No secrets, API keys, internal endpoints, or personal data are included.
• User-facing changes are reflected in \README.md\ / \DOCUMENTATION.md\ where relevant.

Notes for reviewers

Local verification was run on Windows with Node \�20.11.0, which intentionally no longer satisfies the updated engine range. To verify this metadata/docs-only change in the existing local environment, npm scripts were run with engine strict disabled:

• 
  pm --engine-strict=false run build\ passed
• 
  pm --engine-strict=false run typecheck\ passed
• 
  ode node_modules/prettier/bin/prettier.cjs --check package.json package-lock.json README.md CONTRIBUTING.md DOCUMENTATION.md\ passed

I did not mark the full test suite as passing because the current Windows environment previously failed unrelated symlink/path/permission tests. CI uses Node 22 and should be the authoritative full-suite check.

[zeshi-du]

Reviewed and verified — merging. Thanks for the contribution!