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.

AGENTS.md

@@ -130,6 +130,9 @@ artifacts.
 .venv/bin/reuse-surface federation compose
 .venv/bin/reuse-surface graph --check
 
+# Automated tests
+.venv/bin/pytest -q
+
 # Repository hygiene
 rg --files
 git diff --check