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

server/test/entry.test.js

@@ -159,6 +159,7 @@ test('the event verbs are registered, and every budget has a verb that spends it
     'rust.backpack.size',
     'rust.coins.pay',
     'rust.crate.place',
+    'rust.dt.start',
     'rust.kit.entitle',
     'rust.npc.place',
     'rust.participation.collect',
@@ -172,6 +173,7 @@ test('the event verbs are registered, and every budget has a verb that spends it
     'rust.announcements',
     'rust.backpacks',
     'rust.coins',
+    'rust.dt.events',
     'rust.grants',
     'rust.npcs',
     'rust.permissions',
@@ -203,8 +205,9 @@ test('the event verbs are registered, and every budget has a verb that spends it
   // What a teardown can give back is declared honestly: a line said, a
   // collect filed, coins paid (D335) and permissions given for good (D346) are
   // not undone, and nor is a world event called (D354): a cargo ship or a drop
-  // may already hold players or their loot.
-  const once = new Set(['rust.announce', 'rust.participation.collect', 'rust.coins.pay', 'rust.perm.give', 'rust.world.call'])
+  // may already hold players or their loot; nor a Dangerous Treasures event
+  // started, which DT despawns itself (§14.3.4).
+  const once = new Set(['rust.announce', 'rust.participation.collect', 'rust.coins.pay', 'rust.perm.give', 'rust.world.call', 'rust.dt.start'])
   for (const a of actions) {
     assert.strictEqual(a.reversible, once.has(a.id) ? 'none' : 'ledger', a.id)
     // Every param source is one this module registers.