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/visibility/visibility.db.js

@@ -34,7 +34,7 @@ async function getServerPresence(serverId) {
 /** Every configured server with its override, in the operator's own order. */
 async function listServerPresence() {
   return core.query(
-    `SELECT id, name, enabled, presence_audience AS presence
+    `SELECT id, name, enabled, presence_audience AS presence, announce_news AS announceNews
        FROM ${SERVERS}
       ORDER BY sort_order ASC, id ASC`,
   )
@@ -52,4 +52,12 @@ async function setServerPresence(serverId, value) {
   await core.query(`UPDATE ${SERVERS} SET presence_audience = ? WHERE id = ?`, [value, serverId])
 }
 
-module.exports = { getSetting, setSetting, getServerPresence, listServerPresence, setServerPresence }
+/**
+ * Turns one server's news switch on or off (D104). Existence is the model's
+ * question, asked with a read first, for the reason given above.
+ */
+async function setServerNews(serverId, on) {
+  await core.query(`UPDATE ${SERVERS} SET announce_news = ? WHERE id = ?`, [on ? 1 : 0, serverId])
+}
+
+module.exports = { getSetting, setSetting, getServerPresence, listServerPresence, setServerPresence, setServerNews }