feat: establish sbom nexus extraction slice

Assistant: codex
Assistant-Model: gpt-5.6-sol
Assistant-Session: 01a028f0-a42f-7582-89a8-ebaad7343834

registry/README.md

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+# SBOM Nexus capability registry
+
+This directory publishes the reusable product capabilities owned by SBOM Nexus.
+Entries are descriptive discovery records; the HTTP/OpenAPI contract remains the
+runtime interface.

registry/capabilities/capability.infotech.sbom-management.md

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+---
+id: capability.infotech.sbom-management
+type: capability
+name: SBOM management
+repo: sbom-nexus
+domain: infotech
+status: emerging
+interfaces:
+  - http
+  - cli
+---
+
+# SBOM management
+
+Capture repository dependency evidence, preserve immutable SBOM snapshot
+history, query current inventory and licence signals, and select a deterministic
+bounded fleet catch-up queue.
+
+The extraction interface is documented in `ProductRequirementsDocument.md`.

registry/indexes/capabilities.yaml

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+schema: reuse-surface.capability-index.v1
+repo: sbom-nexus
+capabilities:
+  - id: capability.infotech.sbom-management
+    path: registry/capabilities/capability.infotech.sbom-management.md
+    status: emerging