chore(release-node-engine): pin release workflow npm to 11.x

[mayeedwin]

Summary

Fixes an EBADENGINE failure in the release workflow. The "Upgrade npm for Trusted Publishing" step installed npm@latest, which now resolves to npm 12 — and npm 12 dropped Node 20 support:

npm error notsup Not compatible with your version of node/npm: npm@12.0.2
npm error notsup Required: {"node":"^22.22.2 || ^24.15.0 || >=26.0.0"}
npm error notsup Actual:   {"npm":"10.8.2","node":"v20.20.2"}

Fix

Pin the install to npm@^11.5.1:

• 11.5.1 is the minimum version that supports npm Trusted Publishing (why we upgrade in the first place).
• 11.x still supports Node 20 (matches .github/workflows/ci.yml and the release job's setup-node).
• If we later bump the runner to Node 22, we can move to npm@^12 in a separate change.

Test plan

• Actions → Release → Run workflow on this branch with dry_run: true. Confirms the pin resolves and npm publish --dry-run succeeds for all three packages.

🤖 Generated with Claude Code

[gemini-code-assist]

Caution

The consumer version of Gemini Code Assist on GitHub has been sunset. All code review activity has officially ceased.