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.

workplans/REUSE-WP-0008-graph-explorer.md

@@ -0,0 +1,42 @@
+---
+id: REUSE-WP-0008
+type: workplan
+title: "Interactive relation graph explorer"
+domain: helix_forge
+repo: reuse-surface
+status: finished
+owner: codex
+topic_slug: helix-forge
+created: "2026-06-15"
+updated: "2026-06-15"
+state_hub_workstream_id: "63f8a2da-d179-4875-8cff-40a0fa2ca067"
+---
+
+# Interactive relation graph explorer
+
+Close gap analysis priority 16. Provide a browsable HTML view of
+`docs/graph/capability-graph.mmd` for architects (UC-RS-016).
+
+## Add Graph Explorer Page
+
+```task
+id: REUSE-WP-0008-T01
+status: done
+priority: high
+state_hub_task_id: "2d08de47-d3c0-484f-a945-9691da9688e4"
+```
+
+Create `docs/graph/index.html` that renders the Mermaid graph in-browser with
+node labels and a legend for relation types.
+
+## Integrate Graph Generation
+
+```task
+id: REUSE-WP-0008-T02
+status: done
+priority: medium
+state_hub_task_id: "ada96492-88d0-438e-8d2b-ae0fdd8abb06"
+```
+
+Ensure `reuse-surface graph` documents and regenerates both `.mmd` and the
+explorer page dependency. Update `registry/README.md` and `AGENTS.md`.