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/test/entry.test.js

@@ -160,6 +160,7 @@ test('the event verbs are registered, and every budget has a verb that spends it
     'rust.coins.pay',
     'rust.crate.place',
     'rust.dt.start',
+    'rust.gc.place',
     'rust.kit.entitle',
     'rust.npc.place',
     'rust.participation.collect',
@@ -174,6 +175,7 @@ test('the event verbs are registered, and every budget has a verb that spends it
     'rust.backpacks',
     'rust.coins',
     'rust.dt.events',
+    'rust.gc.crates',
     'rust.grants',
     'rust.npcs',
     'rust.permissions',
@@ -206,8 +208,9 @@ test('the event verbs are registered, and every budget has a verb that spends it
   // 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; 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'])
+  // started, which DT despawns itself (§14.3.4); nor a guarded crate placed,
+  // which Guarded Crate cannot end alone (§14.3.5, D373).
+  const once = new Set(['rust.announce', 'rust.participation.collect', 'rust.coins.pay', 'rust.perm.give', 'rust.world.call', 'rust.dt.start', 'rust.gc.place'])
   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.