feat(rust): Rust's own world events — feed, credit rule, triggers, Call a world event (PLAN_REDESIGNS §14.3.1)

The site half of stage 1, on protocol 14:

- server/worldEvents.js: the 24 types, D372's four credit rules, the grid
  from the map's geometry (none off the map), and the per-viewer reading.
- The feed serves `world.event` (a public kind): an unknown type is staff's;
  the event and its grid are public; names only for the presence audience
  (D376); Steam ids and positions only for staff (D353). A downed one carries
  `credited`/`creditedCount` by the server's rule. Client lines for all 24
  types and a World events filter.
- rust_servers.credit_rule (blow, last, most, all; default blow), set on the
  server's settings. Ingest counts heli_kills (patrol helicopters and
  Chinooks, D379) and apc_kills from `world.event` by that rule, so the line
  and Rotorbane / Tankbreaker agree. A protocol-13 tally's heliKills/apcKills
  still add as before.
- The tally's cratesHacked / dropsLooted → crates_hacked / drops_looted;
  title categories Safecracker and Scavenger (D356); leaderboard columns
  Crates hacked and Drops looted, sortable (D377).
- 24 engagement triggers rust.world.<event> (D355): ceiling everyone,
  cooldown subject the server and event (crates add where), names only.
- server/eventWorldCall.js: rust.world.call, "Call a world event"
  (risk change, reversible none, budget rust.world.calls). A position for an
  airdrop or a patrol helicopter only; the Chinook takes none (D378).

Server 585/585 (22 new in test/worldEvents.test.js), client 84/84, every
check; booted against the pinned core (43 triggers, 12 actions, 10 budgets,
20 option sources), routes.manifest unchanged at 89. Engagement manifest and
swagger fragment regenerated.

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

server/model/servers/servers.model.js

@@ -17,6 +17,7 @@
 const core = require('../../core')
 const db = require('./servers.db')
 const { nextWipe } = require('./nextWipe')
+const worldEvents = require('../../worldEvents')
 
 const log = core.logger('servers')
 
@@ -59,6 +60,8 @@ function withToken(row) {
     announceNews: Boolean(Number(row.announceNews)),
     // D142: where that post goes — chat, or a popup.
     newsDelivery: row.newsDelivery === 'popup' ? 'popup' : 'chat',
+    // D372: who a downed helicopter, Chinook or Bradley credits, for ingest.
+    creditRule: worldEvents.creditRuleOf(row.creditRule),
   }
 }
 
@@ -212,6 +215,8 @@ async function listForAdmin(now = Date.now()) {
       // bridge makes. Anything but `patched` is said on the servers page.
       zoneHelper: (state && state.zoneHelper) || null,
       schedule: scheduleOf(row),
+      // D372: who a downed helicopter, Chinook or Bradley credits on this server.
+      creditRule: worldEvents.creditRuleOf(row.creditRule),
     }
   })
 }