Network: media-hub may publish its events (mediahub.video.published, mediahub.picture.uploaded) (#239)

ddiff --git a/server/identity/principals.js b/server/identity/principals.js
iindex be8adeb0..99201c83 100644
---- a/server/identity/principals.js
++++ b/server/identity/principals.js
@@@ -31,6 +31,9 @@ const DEFAULT_GRANTS = [
      // Their pages go into OpenVibe.Search: <svc>.index_document.* through each one's outbox (openvibe-publishing/search-feed,
      // contracts 0.128.0). Inventory publishes already (below).
      ...['work', 'rent', 'help', 'quest'].map((svc) => [svc, 'events.event.publish', 'openvibe.events', []]),
++    // MediaHub publishes mediahub.video.published and mediahub.picture.uploaded (contracts 0.196.0; Events#91 gives a
++    // hyphenated service its namespace without the hyphen).
++    ['media-hub', 'events.event.publish', 'openvibe.events', []],
      // The same two subscriptions for the services that gained an account-event route on 2026-10-09 (SDK 0.37.0
      // startSubscriptions); deals, trade, tips and vip already hold the grant for their other subscriptions.
      ...['watch', 'services', 'wiki', 'blog', 'bot'].map((svc) => [svc, 'events.subscription.manage', 'openvibe.events', []]),