# Overlays

Per-env *sparse* deltas applied on top of `manifests/`. Concept: each overlay
file may set just the fields that differ from the base manifest. The merge
script in `scripts/plan.sh` produces the final per-env service set at
`.orca-out/<env>/`.

For now the overlays are placeholder structures — concrete deltas land with
the milestones that introduce real images and replica counts (M4.1, M5.1, M6.x).