Align Node.js version requirement across docs and package.json #302

Problem

There are two conflicting Node.js version references in the repo:

• *\package.json* \�ngines\ field: >=20.0.0\
• *\docs/src/content/docs/scenarios/troubleshooting.md* (line ~81): States \Node.js 22.0.0 or later\

Suggestion

Instead of pinning to a specific version number, align on Node.js LTS as the requirement. This avoids drift between docs and config, and matches what most users will have installed.

Changes needed

1. Update \package.json\ \�ngines.node\ to reference the current LTS baseline
2. Update \ roubleshooting.md\ line ~81 to say Node.js LTS (currently v22) instead of a hard version
3. Audit other docs for stale Node.js version references

Context

Found during new-user experience documentation audit. The \ive-minute-start.md\ (PR pending) correctly says \Node.js 20+\ matching \package.json, but the troubleshooting page disagrees.

T-shirt size: XS
Priority: P1