Complete WP-0006 through WP-0009: registry expansion, catalog, graph, tests

Register six new capabilities (12 total), add searchable catalog UI and graph
explorer, introduce pytest suite with CI fail-on-warnings, and close gap
analysis priorities 13 and 16. WP-0010 remains backlog for network federation.

registry/capabilities/capability.registry.validate.md

@@ -0,0 +1,88 @@
+---
+id: capability.registry.validate
+name: Registry Entry Validation
+summary: Validate capability registry entries against schema, index consistency, and relation integrity.
+owner: reuse-surface
+status: draft
+domain: helix_forge
+tags: [registry, validation, cli]
+
+maturity:
+  discovery:
+    current: D4
+    target: D5
+    confidence: medium
+    rationale: UC-RS-023 is implemented via reuse-surface validate with schema and drift checks.
+  availability:
+    current: A3
+    target: A3
+    confidence: high
+    rationale: Available as reuse-surface validate CLI command.
+
+external_evidence:
+  completeness:
+    level: C3
+    name: Functional Core
+    confidence: medium
+    basis: scope_vs_intent_and_consumer_expectations
+    satisfied_expectations:
+      - schema validation for entry front matter
+      - index drift detection
+      - optional relation integrity checks
+    broken_expectations: []
+    out_of_scope_expectations:
+      - runtime validation of registered capability implementations
+  reliability:
+    level: R2
+    name: Tolerable
+    confidence: medium
+    basis: consumer_quality_signals
+    known_reliability_risks:
+      - requires local venv install
+
+discovery:
+  intent: Keep registry data structurally sound so agents and humans can trust discovery metadata.
+  includes:
+    - JSON Schema validation
+    - index drift warnings
+    - relation reference checks
+  excludes:
+    - validating implementation code in other repos
+  use_cases:
+    - UC-RS-023
+  research_memos:
+    - specs/UseCaseCatalog.md
+
+availability:
+  current_level: A3
+  target_level: A3
+  current_artifacts:
+    - reuse_surface/cli.py
+    - schemas/capability.schema.yaml
+  consumption_modes:
+    - cli
+
+relations:
+  depends_on:
+    - capability.registry.register
+  supports: []
+  related_to:
+    - capability.registry.register
+
+evidence:
+  documentation:
+    - tools/README.md
+  tests: []
+
+consumer_guidance:
+  recommended_for:
+    - pre-commit and CI validation of registry changes
+  not_recommended_for:
+    - certifying business correctness of capability claims
+  known_limitations:
+    - warnings do not fail CI unless --fail-on-warnings is set
+---
+
+# Registry Entry Validation
+
+Validates registry shape and consistency through the reuse-surface CLI.