k8s(prod): promote v0.8.12 by digest (#352)

Prod moves from v0.8.10@sha256:df2ddd2 to v0.8.12@sha256:332d6df.

Ships the #312 rollup fix (#350) — coarsening a coverage fraction is a
mean over child cells, not MAX — gated on dev at main@7a4403e: 12/12 on
the car-19 (res-8) and car-23 (res-9) benchmark cells across glm-5.2,
kimi-k3 and claude-sonnet-5 at 2 trials, with 30/30 baseline.

Also carries #348 (client-reachable STAC catalog URL), #347 (single
outage runbook) and #349 (pin mcp SDK to 1.x), since v0.8.11 was tagged
but never promoted.

Author: cboettig

k8s/deployment.yaml

@@ -23,7 +23,7 @@ spec:
                     values: ["us-west"]
       containers:
       - name: server
-        image: ghcr.io/boettiger-lab/mcp-data-server:v0.8.10@sha256:df2ddd2734f9dce60d29bf0aeb7b4c6c9bc03328eff41db3ebdff41f9549eda8
+        image: ghcr.io/boettiger-lab/mcp-data-server:v0.8.12@sha256:332d6df730c1fc66e7b2d317b121828fcb3785339a3a43b49789c3e22e6e0ffd
         imagePullPolicy: IfNotPresent
         env:
         - name: STAC_CATALOG_URL