fix(rust): nothing names who is online by default

The org lead's rule, settled 2026-09-22: who is online is always the
narrowest audience - staff - unless an operator deliberately widens it,
and a count is fine where a list of names is not.

The public site broke that in three places since phase 4. The Online
tab named every player, the feed carried joins, respawns, deaths, chat
and tallies, and the leaderboard's lastSeen - refreshed every minute by
a gather tally - said who was on as plainly as either. All three now
sit behind one setting:

* PRESENCE_KINDS, a subset of the public allowlist, gated per request.
  Below the audience the feed keeps the server's own story (wipe, start,
  shutdown) and says presenceHidden rather than looking quiet.
* the Online route answers { players: [], hidden, count, audience } -
  same shape, so an older client renders empty rather than breaking.
* rungs staff / signed_in / public, fleet-wide default in a new
  rust_settings table with an optional per-server override on
  rust_servers; an unknown stored word narrows to staff.
* the viewer's standing is RE-READ from the users row (ctx.users.getById),
  not taken from the token, so a demotion or a ban applies on the next
  request. Walked: a moderator demoted mid-session lost the roll call on
  the same cookie.
* per-viewer answers are Cache-Control: private, no-store.
* GET/PUT /admin/rust/visibility (requireRole admin) and an admin page,
  Rust visibility; every save is one activity-log row.

The browser walk also found every empty state in this module rendering
as a blank box. Core's EmptyState renders children only; this module
passed title/message (the shape the Integration Kit template teaches)
and React dropped both without a word. Fixed module-side with a small
Empty wrapper - nothing core or module-uo renders changes - and a client
test that refuses a titled EmptyState or a PageHeader subtitle.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E14m6SuuY6i1vASFeGDBeY

server/test/catalogue.test.js

@@ -51,7 +51,12 @@ test('a viewer with no kinds asked for gets the allowlist, never everything', ()
   const asPublic = catalogue.kindsFor({})
   const asAdmin = catalogue.kindsFor({ admin: true })
 
-  assert.deepEqual(asPublic, [...catalogue.PUBLIC_KINDS])
+  // The public view with nothing said about presence is the kinds that name
+  // nobody — a wipe, a start, a shutdown.
+  assert.deepEqual(
+    asPublic,
+    catalogue.PUBLIC_KINDS.filter((k) => !catalogue.PRESENCE_KINDS.includes(k)),
+  )
   assert.equal(asAdmin.length, catalogue.ALL_KINDS.length)
 
   // The property that makes the route safe by construction: there is no argument
@@ -61,10 +66,13 @@ test('a viewer with no kinds asked for gets the allowlist, never everything', ()
 })
 
 test('a kind a viewer may not see is dropped, not refused', () => {
-  const asked = catalogue.kindsFor({ requested: ['player.death', 'player.banned'] })
+  const asked = catalogue.kindsFor({ presence: true, requested: ['player.death', 'player.banned'] })
 
   assert.deepEqual(asked, ['player.death'])
 
+  // Without the presence audience a death is dropped too.
+  assert.deepEqual(catalogue.kindsFor({ requested: ['player.death', 'server.wipe'] }), ['server.wipe'])
+
   // Asking for only forbidden kinds answers with nothing to select, which the
   // model turns into an empty list — the events are, as far as this viewer is
   // concerned, not there.
@@ -116,3 +124,26 @@ test('the classification covers exactly the kinds protocol 4 defines', () => {
 
   assert.deepEqual([...catalogue.ALL_KINDS].sort(), [...PROTOCOL_4].sort())
 })
+
+test('every kind that names a player who was on is behind the presence setting', () => {
+  // The org lead's rule (2026-09-22): nothing tells who is online by default.
+  // Each of these says a named player was on the server at a given moment.
+  for (const kind of [
+    'player.connected',
+    'player.disconnected',
+    'player.respawned',
+    'player.death',
+    'player.chat',
+    'player.tally',
+  ]) {
+    assert.ok(catalogue.isPresence(kind), `${kind} must be gated as presence`)
+    assert.ok(!catalogue.kindsFor({}).includes(kind), `${kind} must not reach a default public view`)
+    assert.ok(catalogue.kindsFor({ presence: true }).includes(kind))
+  }
+
+  // A presence kind is a subset of the public ones, never a staff kind widened.
+  for (const kind of catalogue.PRESENCE_KINDS) assert.ok(catalogue.PUBLIC_KINDS.includes(kind))
+
+  // And what is left names nobody.
+  assert.deepEqual(catalogue.kindsFor({}).sort(), ['server.initialized', 'server.shutdown', 'server.wipe'])
+})