.node-version (22.15.1) becomes the single authoritative Node version:
CI/CD select Node only via node-version-file, every Dockerfile pins
node:22.15.1-alpine, and the engines floor in package.json states the
same version (open-ended upwards so a newer local Node keeps working —
reproducibility rests on images and CI). An early CI step fails on any
drift between those places; update procedure in operations.md
(Update strategy). Precondition for the reproducibility claim in #219.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0168Ph5uBmHm8X28CSVpbpnJ
