Upgrade Node.js to 22.22.2 (Active LTS) (#265)

Upgrade Node.js from 18.12.0 to 22.22.2 (Active LTS)

Node 18 reached end-of-life in April 2025. Node 22 is Active LTS and
fixes a crypto availability issue in worker threads that caused
`@rollup/plugin-terser` to fail during bundling on Node 18.

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: dfalling

.tool-versions

@@ -1,2 +1,2 @@
-# 18.12.0 is LTS as of 20/4/2023
-nodejs 18.12.0
+# 22.22.2 is Active LTS as of 2026-03-30
+nodejs 22.22.2