feat(rust): Guarded Crate — feed, map, Warden, Place a guarded crate (PLAN_REDESIGNS §14.3.5)

Stage 6 of the §14.3 integration plan, on protocol 14. Spec: docs
rust-link/PROTOCOL.md §20.9.

- gc.started and gc.ended public, gc.failed staff's; guardedCrate.js reads
  each row per viewer (the clearer's name for the presence audience, Steam id,
  position and key for staff, `won` for everyone).
- Triggers rust.gc.started and rust.gc.ended (a crate a player cleared only).
- The step rust.gc.place: an event from rust.options.gc_events and a world
  call's location; refused at verify for Guarded Crate absent, NpcSpawn missing
  (D364), console unavailable, or an unknown event. Kept (D373); the run log's
  success line says so (D380). Budget rust.gc.crates.
- Warden (D375): guarded_won, title category guardedwon, Crates cleared column.
- Map marker, server settings line, swagger, engagement manifest, bundle, README.

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

README.md

@@ -135,6 +135,15 @@ one now, kept when the run ends: an airdrop or a patrol helicopter can be sent t
   ten minutes after DT loads the step says "Dangerous Treasures is not ready yet" and tries again ten
   minutes later. Refused where DT is absent, or where the framework cannot run DT's console command
   (`docs/modules/rust/PLAN_REDESIGNS.md` §14.3.4).
+- **Guarded Crate** (Bazz3l, 2.0.17), with **NpcSpawn** (Codefling) for its guards. With both: a
+  guarded crate landing and being cleared are public feed lines and triggers (*"Alice cleared the
+  guarded crate · M4"*, the name only for the presence audience), a running crate is on the live map's
+  world layer, the **Crates cleared** leaderboard column and the *Warden* title count the crates a
+  player cleared by killing the last guard, and the step **Place a guarded crate** places one of its
+  events at a monument or a point. The crate is kept when the run ends — Guarded Crate cannot end one
+  alone — and the run log says so. Refused where Guarded Crate or NpcSpawn is absent, where the event
+  is not one the server has, or where the framework cannot run its console command
+  (`docs/modules/rust/PLAN_REDESIGNS.md` §14.3.5).
 
 News and event lines said in chat can wear one styled group's title and colours — the
 **announcement voice**, chosen in Admin → Rust servers. The line is said by the bridge plugin with no