Draft capability entry (reuse-surface REUSE-WP-0017-T04, cohort 3)

Honest first-pass maturity vector grounded in README/docs/tests present
in this repo; no invented evidence. Flagged for human review before
publish. See reuse-surface history/2026-07-06-coverage-classification.md.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

registry/indexes/capabilities.yaml

@@ -1,4 +1,20 @@
 version: 1
-updated: '2026-06-16'
+updated: '2026-07-06'
 domain: helix_forge
-capabilities: []
+capabilities:
+- id: capability.railiance.platform-services
+  name: Railiance Platform Services
+  summary: 'S3 Platform Services layer of the Railiance OAS Stack — shared cluster services: PostgreSQL
+    HA, Valkey cache, secret management, identity integration, and object storage.'
+  vector: D3 / A2 / C1 / R0
+  domain: financials
+  status: draft
+  owner: railiance-platform
+  path: registry/capabilities/capability.railiance.platform-services.md
+  tags:
+  - railiance
+  - platform
+  - secrets
+  - postgres
+  consumption_modes:
+  - cli (shell/python scripts)