fix: enforce Node 22 runtime before startup

[Kaguya-19]

Summary

• reject Node versions outside ">=22.13.0 <23" in the shared runtime check, with a clearer native ABI mismatch message
• align UI and edgeclaw-memory-core engine ranges with the root package and add a root .nvmrc for Node 22
• run the runtime check from the UI server entry so direct desktop/server starts fail before loading native packages
• add a regression test covering Node 22 acceptance and Node 25 rejection

Verification

• Node 25.5.0: node scripts/check-node-runtime.mjs fails immediately with the Node 22 requirement
• Node 22.22.0: node scripts/check-node-runtime.mjs passes
• Node 22.22.0: tsx --test tests/cli/check-node-runtime.spec.ts passes
• Node 25.5.0: node --import tsx ui/server/index.js fails at runtime check before native package loading
• Node 22.22.0: npx tsc -p tsconfig.json --noEmit passes in the dependency-installed worktree
• Node 22.22.0: npm --workspace ui run start:built starts both UI server and gateway on temporary ports, then was stopped cleanly