feat(bridge): Dangerous Treasures on protocol 14 (PLAN_REDESIGNS §14.3.4)

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

- Three events from DT's own hooks: dt.started { x, z, key? },
  dt.won { steamId, name, invaders (max 32), invaderCount, x, z } and
  dt.ended { x, z }. None while the world is not live; a win still counts.
- The start hook fires inside the call that opens the chest, so the key a
  dt.start is running joins its start exactly, not by a ten-second window.
- dt.start { key, level 0-2 } runs `dtevent <level>` through
  ConsoleSystem.Run and answers dt.opened { key, level, repeat, x, z }. A key
  already answered is answered again and opens nothing (kept seven days in
  dt-starts.json). Refusals: malformed, bad-level, dt-missing,
  console-unavailable (D363), dt-not-ready (nothing opened, DT's own "Manual
  Event Failed" reply, under fifteen minutes since DT loaded, D365),
  dt-no-spot (after), refused (anything else DT said).
- The tally gains treasuresWon (Treasure Hunter, D375); map.live's world gains
  kind "treasure" for each running chest, seeded at load from DT's chests in
  the world (DT has no API that lists them).
- Hello's integrations gain dangerousTreasures, sent again on DT's load and
  unload. rg.world prints dangerousTreasures, treasures, dtStarts and
  dtWarmingUp. README lists Dangerous Treasures.

checkPlugin: 81 hooks, every one void and listed; 18 tests. Compiled and
loaded on both rigs (Rust 25902425, Oxide 2.0.7830, Carbon 2.0.262);
rg.world read dangerousTreasures=False treasures=0, then both went back on
the protocol-13 bridge.

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

README.md

@@ -119,6 +119,13 @@ HunterZ's `Dynamic PVP` (which needs ZoneManager and TruePVE) is optional too. W
 PvP zones it opens around a downed helicopter, a Bradley, cargo and the rest reach the site's feed and
 its map. The bridge only reads them: it never makes, maps or erases one of Dynamic PVP's zones.
 
+nivex's `Dangerous Treasures` is optional as well. Where it is loaded, its treasure events reach the
+site's feed, its map and the *Treasure Hunter* title, and an event can open one (`dt.start`) through
+DT's own `dtevent` console command; DT picks the spot and despawns its own chest. For about ten minutes
+after DT loads it is still finding its spots, and a start then is answered "not ready yet". A framework
+that cannot run another plugin's console command from code (`rg.world` says `consolePlugins=False`)
+cannot open one.
+
 Rust's own world events need no plugin at all. The patrol helicopter, Bradley, the cargo ship, the
 Chinook, airdrops, locked crates, the Travelling Vendor, the satellite and the Deep Sea reach the
 site's feed and its event triggers on every server, and an event can call one of them (`world.call`).