fix: reduce Jest heap to 2560MB to avoid container OOMKill

--max-old-space-size applies per Node process. With 2 workers + parent,
6144MB × 3 = 18GB potential heap vs 8Gi container limit → OOMKilled.
2560MB × 3 = ~7.5GB fits within the 8Gi limit.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Mbd06b

Jenkinsfile

@@ -179,7 +179,8 @@ spec:
                     dir('sophia') {
                         sh '''#!/bin/bash
                             set -euo pipefail
-                            export NODE_OPTIONS="--max-old-space-size=6144"
+                            # 2560MB per process × 3 (parent + 2 workers) fits in 8Gi container
+                            export NODE_OPTIONS="--max-old-space-size=2560"
                             pnpm exec jest --ci --coverage --maxWorkers=2
                         '''
                     }