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

client/test/feed.test.js

@@ -155,3 +155,55 @@ test('an unknown filter falls back to everything rather than to nothing', () =>
   assert.deepEqual(kindsFor('nonsense'), FEED_KINDS)
   assert.deepEqual(kindsFor(undefined), FEED_KINDS)
 })
+
+// ── Rust's own world events (protocol 14, PLAN_REDESIGNS §14.3.1) ─────────
+//
+// The frames here are what the SERVER sends a viewer (`worldEvents.shapeFor`),
+// not what the plugin emitted: a grid instead of a position, names only for the
+// presence audience, `credited` by the server's rule.
+
+const world = (frame) => row('world.event', { kind: 'world.event', ...frame })
+
+test('a downed helicopter names whom the rule credits, and only them', () => {
+  const one = describe(world({ event: 'heli.downed', grid: 'G7', creditRule: 'blow', creditedCount: 1, credited: [{ name: 'Alice' }] }))
+  assert.deepEqual([one.tone, one.verb, one.subject, one.detail], ['kill', 'Patrol helicopter downed by', 'Alice', 'G7'])
+
+  const many = describe(world({ event: 'heli.downed', grid: 'G7', creditRule: 'all', creditedCount: 4, credited: [{ name: 'Alice' }, { name: 'Bob' }, { name: 'Cleo' }, { name: 'Dov' }] }))
+  assert.equal(many.subject, 'Alice, Bob and 2 others')
+})
+
+test('below the presence audience the same line names nobody (D376)', () => {
+  const line = describe(world({ event: 'heli.downed', grid: 'G8', creditRule: 'blow', creditedCount: 1 }))
+  assert.deepEqual([line.verb, line.subject, line.detail], ['Patrol helicopter downed', null, 'G8'])
+
+  const hack = describe(world({ event: 'crate.hack.started', where: 'oilrig_large', grid: 'C3' }))
+  assert.equal(hack.actor, null)
+  assert.equal(hack.verb, 'A locked crate is being hacked on Large Oil Rig')
+})
+
+test('a named line reads as the plan writes it', () => {
+  const hack = describe(world({ event: 'crate.hack.started', where: 'oilrig_large', name: 'Bob' }))
+  assert.equal(`${hack.actor} ${hack.verb}`, 'Bob started hacking the locked crate on Large Oil Rig')
+
+  const road = describe(world({ event: 'bradley.spawned', where: 'road', count: 12 }))
+  assert.equal(road.verb, '12 road Bradleys are out')
+
+  assert.equal(describe(world({ event: 'deepsea.opened' })).verb, 'The Deep Sea is open')
+  assert.equal(describe(world({ event: 'cargo.docked', harbourName: 'Harbor', grid: 'Q9' })).verb, 'The cargo ship has docked at Harbor')
+  assert.equal(describe(world({ event: 'chinook.dropped', monumentName: 'Water Treatment Plant' })).verb, 'A Chinook dropped a locked crate at Water Treatment Plant')
+})
+
+test('every type the server knows has its own words, and an unknown one says its name', () => {
+  const { TYPE_IDS } = createRequire(import.meta.url)('../../server/worldEvents.js')
+  for (const event of TYPE_IDS) {
+    const line = describe(world({ event }))
+    assert.notEqual(line.tone, 'other', `${event} has no words of its own`)
+    assert.ok(line.verb && line.verb !== event, event)
+  }
+  assert.equal(describe(world({ event: 'meteor.landed' })).verb, 'meteor.landed')
+})
+
+test('the world filter asks for world events, which the server serves publicly', () => {
+  assert.deepEqual(kindsFor('world'), ['world.event'])
+  assert.ok(FEED_KINDS.includes('world.event'))
+})