feat(rust): the rewards — tally, kit reward, chat and the news leg (phase 13b, protocol 10)

Four event verbs and the announce leg, per PLAN.md §29:

- rust.participation.open / .collect: the plugin counts who takes part
  (seconds, kills or both, in a zone this run opened or the whole server)
  and collect files them as the run's participants, keyed by Steam id.
- rust.kit.entitle: the five recipient modes (D101), rows in the new
  rust_perm_run_grants (D84) unioned into the permission push, one extra
  use of the kit per reward as site-held credits on perm.sync (D103),
  and the rust.kit.entitled notice deferred from phase 10 (D64).
- rust.announce: one server or every server (D105).
- rust.chat announce leg, speaking only on servers whose new news switch
  is on (D104) - a card on Admin -> Rust visibility (D106).

Budgets rust.grants and rust.announcements; the kit source and four
fixed-choice sources (core has no enum param type). rust_perm_run_grants
carries core's idempotency key so a revert of a lost answer can find its
rows. Protocol 10.

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

server/model/servers/servers.model.js

@@ -48,12 +48,33 @@ function withToken(row) {
     }
   }
 
-  return { id: row.id, name: row.name, baseUrl: row.sidecarBaseUrl, token, protocol: row.protocol }
+  return {
+    id: row.id,
+    name: row.name,
+    baseUrl: row.sidecarBaseUrl,
+    token,
+    protocol: row.protocol,
+    // D104: whether a published news post is said in this server's chat.
+    announceNews: Boolean(Number(row.announceNews)),
+  }
+}
+
+/**
+ * How many servers were enabled when this process last looked. An action's
+ * `cost()` is synchronous and cannot ask the database, so `rust.announce` to
+ * every server is priced at this — refreshed by every poll, which runs
+ * continuously. One until the first poll, which is the least a fleet can be.
+ */
+let enabledCount = 1
+
+function lastEnabledCount() {
+  return enabledCount
 }
 
 /** Every enabled server, with tokens, for the poller. */
 async function listForPolling() {
   const rows = await db.listServers({ enabledOnly: true })
+  enabledCount = rows.length
   return rows.map(withToken)
 }
 
@@ -165,6 +186,7 @@ module.exports = {
   STALE_AFTER_MS,
   withToken,
   listForPolling,
+  lastEnabledCount,
   listPublic,
   getPublic,
   listForAdmin,