docs: readme says Node >= v18, package.json engines requires >= 22

[alexbj75]

Problem

readme.md, Development section, states:

Requires Node JS engine >= v18

The code requires 22:

• package.json (v4.1.0): "engines": { "node": ">=22.0.0" }
• Dockerfile: ARG NODE_IMAGE=node:22-alpine
• .github/workflows/unittests.yml: node-version: '22.x'

Commit 05fd2bad ("chore: update node version", #259, 2026-07-03) raised the engines floor. readme.md was not touched in that commit, and its two edits since (2026-08-09, 2026-08-10) were to unrelated sections.

Why it is worth fixing rather than leaving

A reader who follows the readme and provisions Node 18 hits an engines failure on install. The gap is also propagating: it was found while fact-checking a self-hosting guide on intercom.apps.osaas.io that had taken v18 from this readme in good faith and promoted it from a development note into a top-level requirements list. That guide has been corrected to 22, sourced from package.json rather than from here.

Fix

Either update the readme to 22, or drop the hardcoded number and point at package.json, which is the thing that actually enforces it and cannot drift from itself.

Actionability

• Who can act: repo maintainers.
• Type of work: one line of documentation.
• Effort: XS.
• Evidence: package.json, Dockerfile and .github/workflows/unittests.yml on main, read 2026-09-13; commit history for readme.md and 05fd2bad via the GitHub API the same day.

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