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

server/model/events/events.db.js

@@ -153,6 +153,8 @@ const TITLE_SUMS = {
   dropsLooted: 'drops_looted',
   // Protocol 14 (D375): Treasure Hunter.
   treasuresWon: 'treasures_won',
+  // Protocol 14 (D375): Warden.
+  guardedWon: 'guarded_won',
 }
 
 /** The two *best* fields and their columns: the longest single kill, never a sum. */
@@ -354,6 +356,8 @@ async function leaderboard({ serverId, wipeId = null, sort = 'kills', limit = 25
     dropsLooted: 'drops_looted',
     // Protocol 14 (D375): Dangerous Treasures won, Treasure Hunter's column.
     treasuresWon: 'treasures_won',
+    // Protocol 14 (D375): guarded crates cleared, Warden's column.
+    guardedWon: 'guarded_won',
   }[sort] || 'kills'
 
   const params = [serverId]
@@ -381,6 +385,7 @@ async function leaderboard({ serverId, wipeId = null, sort = 'kills', limit = 25
             SUM(s.crates_hacked) AS cratesHacked,
             SUM(s.drops_looted) AS dropsLooted,
             SUM(s.treasures_won) AS treasuresWon,
+            SUM(s.guarded_won) AS guardedWon,
             MAX(s.balance) AS balance,
             MAX(s.last_seen) AS lastSeen
        FROM ${STATS} s