WP-0015: roster publish sweep 59/60, dedup activity-core stub

Mark 11 formerly-blocked repos publish pass after Gitea visibility fix.
Point whynot-control/design federation URLs at whynot/ org paths.
Remove activity-core owner stub from reuse-surface index (owner index
now fetchable). tegwick-control remains blocked (no HTTP-visible repo).

registry/federation/sources.yaml

@@ -410,14 +410,14 @@ sources:
   cache_ttl_seconds: 86400
   auth_header: Authorization
 - repo: whynot-control
-  url: https://gitea.coulomb.social/coulomb/whynot-control/raw/main/registry/indexes/capabilities.yaml
+  url: https://gitea.coulomb.social/whynot/whynot-control/raw/main/registry/indexes/capabilities.yaml
   enabled: true
   required: false
   domain: helix_forge
   cache_ttl_seconds: 86400
   auth_header: Authorization
 - repo: whynot-design
-  url: https://gitea.coulomb.social/coulomb/whynot-design/raw/main/registry/indexes/capabilities.yaml
+  url: https://gitea.coulomb.social/whynot/whynot-design/raw/main/registry/indexes/capabilities.yaml
   enabled: true
   required: false
   domain: helix_forge