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/swagger/doc.js

@@ -275,6 +275,20 @@ module.exports = {
                 description: 'Protocol 14 (PLAN_REDESIGNS §14.3.4): where loaded, its treasure events reach the feed, the map and Treasure Hunter, and a step may start one (where `console.plugins` is true).',
                 properties: { loaded: { type: 'boolean', example: true }, version: { type: 'string', example: '3.0.0' } },
               },
+              guardedCrate: {
+                type: 'object',
+                description: 'Protocol 14 (PLAN_REDESIGNS §14.3.5): where loaded, its guarded crates reach the feed, the map and Warden, and a step may place one (where NpcSpawn is loaded and `console.plugins` is true). `events` are the event names in its data file, absent when the file could not be read.',
+                properties: {
+                  loaded: { type: 'boolean', example: true },
+                  version: { type: 'string', example: '2.0.17' },
+                  npcSpawn: {
+                    type: 'object',
+                    description: 'NpcSpawn, which its guards need (D364).',
+                    properties: { loaded: { type: 'boolean', example: true }, version: { type: 'string', example: '3.4.8' } },
+                  },
+                  events: { type: 'array', items: { type: 'string' }, example: ['Easy', 'Medium', 'Hard', 'Elite'] },
+                },
+              },
             },
           },
           console: {