chore(infra): drop temporal-pg storage/retention changes from this branch

The postgrescluster.yml PVC sizing + retention edits are superseded and
wrong-layer, so they are removed here to leave this PR as the numeric-zero
recovery feature only:

- pgdata 5Gi and retention 14d are already on develop (block-incremental +
  retention reduction) / covered by #236 (AI-1823).
- prod repo1 genuinely needs 22Gi (live: 22Gi PVC, 12G used, spec still 10Gi,
  PersistentVolumeResizing=Invalid), but that belongs as a prod-resources
  overlay patch in #236 — not a base edit that would also force fd34fb-test
  and ephemeral instances up.

File is now identical to develop; this PR no longer touches infra.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: alex-struk

deployments/openshift/kustomize/base/temporal/postgrescluster.yml

@@ -20,7 +20,7 @@ spec:
           - 'ReadWriteOnce'
         resources:
           requests:
-            storage: 5Gi
+            storage: 1.5Gi
       sidecars:
         replicaCertCopy:
           resources:
@@ -30,8 +30,13 @@ spec:
   backups:
     pgbackrest:
       global:
-        repo1-retention-full: '7'
+        repo1-retention-full: '14'
         repo1-retention-full-type: time
+        # Block incremental: back up only the changed blocks within a file rather
+        # than re-copying the whole changed file segment, preventing backup/WAL
+        # bloat. Requires bundling. (pgBackRest 2.46+)
+        repo1-block: 'y'
+        repo1-bundle: 'y'
       repos:
         - name: repo1
           schedules:
@@ -44,7 +49,7 @@ spec:
                 - 'ReadWriteOnce'
               resources:
                 requests:
-                  storage: 22Gi
+                  storage: 10Gi
       repoHost:
         resources:
           requests: