Trigger a fresh CI run for the composed L1
Why: the previous CI runs failed on unrelated flaky tests (svc deployment, instance restart timing, svc identity — each a different test per run); the composed L1 (backend 424c611 + frontend 113103f) passes full make test locally (113 ok) and needs a clean CI run for the delivery gate. Impact: empty commit on the L1 branch. Refs: PR #634.
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