release(helm): buzz chart 0.1.6 (#2109)

Signed-off-by: Tyler Longwell <tlongwell@block.xyz>
Co-authored-by: npub1qyvc0c5kl4gqv2fd97fsk46tu378sqgy35vc83rvgfwne90sel7s0ed67d <011987e296fd5006292d2f930b574be47c7801048d1983c46c425d3c95f0cffd@sprout-oss.stage.blox.sqprod.co>
Co-authored-by: Tyler Longwell <tlongwell@block.xyz>

deploy/charts/buzz/Chart.yaml

@@ -7,7 +7,7 @@ description: |
   PostgreSQL and Redis. Configurable for single-node evaluation
   (subcharts on) and HA production (external services, existingSecret).
 type: application
-version: 0.1.5
+version: 0.1.6
 appVersion: "0.1.0"
 home: https://github.com/block/buzz
 sources:
@@ -23,8 +23,8 @@ maintainers:
     url: https://github.com/block
 annotations:
   artifacthub.io/changes: |
-    - kind: changed
-      description: Allow CPU-only relay autoscaling when no custom-metrics adapter is installed.
+    - kind: added
+      description: Optional READ_DATABASE_URL env (secretKeyRef) enabling relay read-replica routing; absent key preserves prior behavior.
   artifacthub.io/license: Apache-2.0
 
 # Optional eval-only subcharts. Production deploys disable both and point