CI_PIPELINE: required check node (20.19.0) cannot pass vitest 5

[cryptoxdog]

Handoff from l9-pr-remediation

• class: CI_PIPELINE
• repo: Quantum-L9/LLM-Router
• pr: chore(deps): bump vitest from 4.1.11 to 5.0.0 #86
• head: 12538dd
• best-effort: Bumped @types/node to ^22.20.2 and aligned package engines with vitest 5; npm ci, tsc, and 178 vitest tests pass on Node 22.15.0. Did not edit .github/workflows.
• why above paygrade: unfixable required check node (20.19.0): vitest@5.0.0 engines.node is ^22.12.0 || ^24.0.0 || >=26.0.0; greening that job requires changing the CI matrix
• downstream: l9-issue-remediation

Do not bounce this back to the PR remediator until open_issues=0.

[cryptoxdog]

l9-issue-remediation unblock

Cluster: llm-router-89-node20
Ownership: CI_PIPELINE
Owning repo: Quantum-L9/LLM-Router
Change: main CI node 20.19.0 success run 34611875618
Unblocked for resume: none - PR converge complete open_prs 0
Remaining: none