diff --git a/registry/capabilities/capability.railiance.substrate-bindings.md b/registry/capabilities/capability.railiance.substrate-bindings.md
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+---
+id: capability.railiance.substrate-bindings
+owner: reef-railiance
+status: draft
+domain: infotech
+maturity:
+  discovery:
+    current: D3
+    target: D5
+    confidence: medium
+    rationale: Owner scope, neighboring responsibilities, concrete use cases and limitations
+      are documented; no exhaustive or generalized maturity claim.
+  availability:
+    current: A0
+    target: A0
+    confidence: medium
+    rationale: 'Source interface assessed 2026-10-14: Grouped home-reef identity,
+      topology and placement declarations. Availability describes the delivery form,
+      not production acceptance. Declarations are not automatic placement or authorization.'
+external_evidence:
+  completeness:
+    level: C1
+    confidence: low
+    basis: Source artifacts establish a bounded capability; no independent consumer-completeness
+      assessment in this review.
+  reliability:
+    level: R0
+    confidence: low
+    basis: No longitudinal consumer reliability measurement established by this review.
+name: Substrate topology and bindings
+summary: Grouped home-reef identity, topology and placement declarations.
+tags:
+- security
+- netkingdom
+- framework-reuse
+discovery:
+  intent: Grouped home-reef identity, topology and placement declarations
+  includes:
+  - Grouped home-reef identity, topology and placement declarations
+  excludes:
+  - Declarations are not automatic placement or authorization
+  use_cases:
+  - 'U13: Platform owner deploys and rolls back a workload with explicit substrate
+    and custody bindings'
+  - 'U14: Framework adopter validates and reuses selected contracts, tools and reference
+    compositions'
+availability:
+  current_level: A0
+  target_level: A0
+  current_artifacts:
+  - SCOPE.md
+  consumption_modes:
+  - informational
+relations:
+  related_to:
+  - capability.security.iam-tooling-suite
+evidence:
+  documentation:
+  - SCOPE.md
+consumer_guidance:
+  recommended_for:
+  - Platform owner deploys and rolls back a workload with explicit substrate and custody
+    bindings
+  - Framework adopter validates and reuses selected contracts, tools and reference
+    compositions
+  not_recommended_for:
+  - Declarations are not automatic placement or authorization
+  known_limitations:
+  - Declarations are not automatic placement or authorization
+  - 2026-10-14 architecture review estimates operational maturity separately; a registry
+    entry does not authorize execution or establish deployment.
+---
+
+# Substrate topology and bindings
+
+Grouped home-reef identity, topology and placement declarations.
+
+## Reuse boundary
+
+Declarations are not automatic placement or authorization.
+
+## Supported use cases
+
+- U13: Platform owner deploys and rolls back a workload with explicit substrate and custody bindings
+- U14: Framework adopter validates and reuses selected contracts, tools and reference compositions
+
+## Evidence and integration
+
+- [SCOPE.md](../../SCOPE.md)
+
+Assessment: CUST-WP-0081, 2026-10-14. Relations identify interfaces to compose; they do not certify native integration. Existing external evidence levels are retained where present. New entries use conservative C1/R0 until consumer assessment exists.
diff --git a/registry/indexes/capabilities.yaml b/registry/indexes/capabilities.yaml
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+version: 1
+domain: infotech
+capabilities:
+- id: capability.railiance.substrate-bindings
+  name: Substrate topology and bindings
+  summary: Grouped home-reef identity, topology and placement declarations.
+  domain: infotech
+  status: draft
+  owner: reef-railiance
+  tags:
+  - security
+  - netkingdom
+  - framework-reuse
+  vector: D3 / A0 / C1 / R0
+  path: registry/capabilities/capability.railiance.substrate-bindings.md
+  consumption_modes:
+  - informational
+updated: '2026-10-14'