feat: record live Scaleway backup bucket attributes

Bucket railiance-platform-pg-backup is private in nl-ams with versioning
and a 30-day lifecycle. Fill reef attributes and topology. Create script
is idempotent. Billing budget still needs a console click.

substrate/object-stores/platform-audit-storage.yaml

@@ -1,17 +1,16 @@
-# Planned primary for RESOURCE-WP-0002. Fill endpoint/bucket/prefix after purchase.
-# No secrets in this file.
+# Live attributes for RESOURCE-WP-0002. No secrets in this file.
 schema_version: "0.1"
 resource_id: resource:platform:audit-storage
 provider: Scaleway
 product: standard-multi-az
-status: planned
-endpoint: null
+status: active
+endpoint: https://s3.nl-ams.scw.cloud
 region: nl-ams
-bucket: null
-prefix: null
-versioning: null
-lifecycle: null
-provider_project_ref: null
+bucket: railiance-platform-pg-backup
+prefix: platform-pg/
+versioning: true
+lifecycle: 30-day current and noncurrent expiration
+provider_project_ref: e1a0dd0e-04b8-4ea9-8b30-d53f8c35c688
 intended:
   public_access: disabled
   versioning: true
@@ -22,3 +21,5 @@ notes:
   - Destination for rapp-postgres WAL and base backups once procured.
   - resource-control cites reef:storage/substrate/object-stores/platform-audit-storage.yaml#<key>
   - "Decision record: resource-control/docs/evidence/RESOURCE-WP-0002-primary-selection-2026-08-14.md"
+  - Created 2026-08-14. Versioning enabled. ACL owner-only FULL_CONTROL.
+  - Cost alert not set via API. Bootstrap key lacks write billing_budgets. Founder must create a 20 EUR monthly budget in the Scaleway console.