feat(rust): Dangerous Treasures — feed, map, Treasure Hunter, Start a Dangerous Treasures event (PLAN_REDESIGNS §14.3.4)

Stage 5 of the §14.3 integration plan, on protocol 14 (docs
rust-link/PROTOCOL.md §20.8).

- dt.started and dt.won are public kinds, dt.ended a staff kind. The new
  dangerousTreasures.js reads each row per viewer: grid and invaderCount for
  everyone, the winner's name for the presence audience (D376), the position,
  the step's key, the winner's Steam id and the invaders for staff.
- Feed lines in the World events filter: "A Dangerous Treasures event has
  started · K12", "Alice won the treasure · K12 · 3 players fought for it".
- Triggers rust.dt.started (with byEvent) and rust.dt.won, public, cooldown
  subject the server, names only.
- eventDangerousTreasures.js: rust.dt.start, "Start a Dangerous Treasures
  event" (risk change, reversible none, budget rust.dt.events), server and
  difficulty. Refused at verify where the server said DT is not loaded or
  console.plugins is false (Rust-Plugins#34). dt-not-ready answers "Dangerous
  Treasures is not ready yet" with retryAfterMs 600000 (D365, D371);
  dt-no-spot retries on core's delay; DT's own refusals are permanent.
- Treasure Hunter (D375): treasuresWon -> treasures_won, the title category
  treasureswon, and a sortable Treasures column shown where the server
  reports DT or a row counts one.
- The map draws a running chest on the world layer; the server settings'
  plugin line names DT and whether a step can start one, from the
  integrations read's new `console`.
- coreApi ^1.15.0, ci/core-ref.json pinned to website main at #215's merge.
  ci/bundle.json ships the two new files; swagger fragment and engagement
  manifest regenerated; README lists DT.

Server 627/627 (16 new in test/dangerousTreasures.test.js) and every check;
client 92/92, build and externals. Booted against the pinned core: 45
triggers, 13 actions, 11 budgets, 21 option sources; 89 routes unchanged.

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

client/src/lib/feed.js

@@ -50,6 +50,11 @@ export const FEED_KINDS = Object.freeze([
   // Dynamic PVP's zones opening (§14.3.3). A closing (`pvp.zone.deleted`) is
   // staff's and is not asked for here; the map shows a zone go.
   'pvp.zone.created',
+  // Dangerous Treasures (§14.3.4): a chest opening, and one won. The server reads
+  // each for the viewer, so the winner's name is here only where it may be; the
+  // ending (`dt.ended`) is staff's, and the map shows the chest go.
+  'dt.started',
+  'dt.won',
 ])
 
 /** The filters the feed offers, and the kinds each one asks the API for. */
@@ -64,7 +69,7 @@ export const FILTERS = Object.freeze([
   },
   { id: 'server', label: 'Server', kinds: ['server.wipe', 'server.initialized', 'server.shutdown'] },
   { id: 'bosses', label: 'Bosses', kinds: ['npc.boss.spawned', 'npc.boss.died'] },
-  { id: 'world', label: 'World events', kinds: ['world.event', 'pvp.zone.created'] },
+  { id: 'world', label: 'World events', kinds: ['world.event', 'pvp.zone.created', 'dt.started', 'dt.won'] },
 ])
 
 export function kindsFor(filterId) {
@@ -158,6 +163,11 @@ export function describe(row) {
     case 'pvp.zone.deleted':
       return pvpLine(row.kind, frame)
 
+    case 'dt.started':
+    case 'dt.won':
+    case 'dt.ended':
+      return treasureLine(row.kind, frame)
+
     default:
       return { tone: 'other', actor: name, verb: String((row && row.kind) || 'unknown'), subject: null, detail: '' }
   }
@@ -346,4 +356,25 @@ function pvpLine(kind, frame) {
   return { tone: 'kill', actor: null, verb: `A PvP zone opened${around}`, subject: null, detail }
 }
 
+/**
+ * Dangerous Treasures (protocol 14, PLAN_REDESIGNS §14.3.4). The server has read
+ * the frame for this viewer: `grid`, `invaderCount`, and the winner's `name` only
+ * for the presence audience (D376).
+ */
+function treasureLine(kind, frame) {
+  const grid = frame.grid || ''
+  if (kind === 'dt.started') {
+    return { tone: 'server', actor: null, verb: 'A Dangerous Treasures event has started', subject: null, detail: grid }
+  }
+  if (kind === 'dt.ended') {
+    return { tone: 'server', actor: null, verb: 'A Dangerous Treasures event has ended', subject: null, detail: grid }
+  }
+  const n = Number(frame.invaderCount)
+  const fought = n > 1 ? `${n} players fought for it` : ''
+  const detail = [grid || null, fought || null].filter(Boolean).join(' · ')
+  return frame.name
+    ? { tone: 'kill', actor: frame.name, verb: 'won the treasure', subject: null, detail }
+    : { tone: 'kill', actor: null, verb: 'The treasure was won', subject: null, detail }
+}
+
 export default { describe, FEED_KINDS, FILTERS, kindsFor }