k8s(cluster): three voters is the desired state, on the read-path fix image

Two outages in one session came from this file claiming `replicas: 0` while the
cluster served traffic: a plain `kubectl apply` scaled it to zero, twice. Source
now states production intent. Parking stays an explicit `kubectl scale`
divergence recorded in k3s-fleet/cluster-state.yaml, and
scripts/restore-fleet.sh remains the guarded path back - its storage, image, and
per-node capacity preflights are exactly what a bare apply does not do.

Pins server:m12-consumer-readpath-20260818@sha256:9191233d..., the build with the
transport-aware read budget and the scatter-degraded counters. Verified after the
rolling update: 3/3 Ready, all regions lag 0, every replica answering 3/3 shards
with degraded=false on the default budget.

k8s/cluster/statefulset.yaml

@@ -21,7 +21,15 @@ metadata:
     app.kubernetes.io/component: cluster-node
 spec:
   serviceName: tidaldb-peers  # the headless peer Service — stable per-pod DNS
-  replicas: 0                 # parked; scripts/restore-fleet.sh restores three voters explicitly
+  # PRODUCTION as of 2026-08-18: three voters is the desired state, not a value
+  # only the restore script may set. `replicas: 0` lived here while the cluster
+  # was parked and it cost two outages in one session: a plain `kubectl apply` of
+  # this file scaled a LIVE cluster to zero, twice, because the manifest still
+  # claimed parked. Source states intent; parking is an explicit `kubectl scale`
+  # divergence recorded in k3s-fleet/cluster-state.yaml, and
+  # scripts/restore-fleet.sh remains the guarded path back (its storage, image,
+  # and per-node capacity preflights are what a bare apply does not do).
+  replicas: 3
   # Parallel: bring all pods up at once. There is no ordered-bootstrap
   # dependency — siblings boot in any order (an unreachable-at-startup peer is
   # normal; the election + catch-up timer converge them). Ordered start would
@@ -83,7 +91,7 @@ spec:
               mountPath: /data
       containers:
         - name: tidaldb
-          image: registry.threesix.ai/tidal/server:m12-fleet-remediation-20260813@sha256:2e4baaf974ad2cf650609b1843689122bf4fd2751bcb8749906df8089223f4a3
+          image: registry.threesix.ai/tidal/server:m12-consumer-readpath-20260818@sha256:9191233d012e41fd92bb6d0efea83b60010995a6fc6e3ebc894f3d7c5f72872a
           imagePullPolicy: IfNotPresent
           # The image ENTRYPOINT is the bare binary. We override the command with
           # a tiny /bin/sh wrapper (the bookworm-slim runtime HAS a shell) so we