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/engagement/seeds.js

@@ -32,7 +32,7 @@
 // ── One rule group per family ─────────────────────────────────────────────
 //
 // A group is seeded ONCE (per deployment, per key), so a rule appended to a
-// group in a later version reaches fresh installs only. Seven families, seven
+// group in a later version reaches fresh installs only. Eight families, eight
 // keys: a future raid rule takes `raid-v2` without disturbing anybody's clan
 // rules. Every rule is disabled — core ignores `enabled` rather than trusting it
 // — so installing this module mails nobody until an operator decides it should.
@@ -234,6 +234,25 @@ const RULE_GROUPS = Object.freeze([
       },
     ],
   },
+  {
+    // Its own group, not a rule appended to `account-v1`: a group is seeded once,
+    // so an appended rule would reach fresh installs only (R7).
+    key: 'rewards-v1',
+    note: 'module-rust: an event rewarded you a kit (disabled)',
+    rules: [
+      {
+        trigger_id: 'rust.kit.entitled',
+        name: 'Kit reward earned',
+        audience: 'owner',
+        // Email as well: a reward granted at 03:00 is news the person reads the
+        // next morning, before they are next in game or on the site.
+        channels: ['email', 'inapp'],
+        template_keys: GENERIC,
+        cooldown_seconds: 0,
+        max_sends_per_hour: 200,
+      },
+    ],
+  },
   {
     key: 'clans-v1',
     note: 'module-rust: clan departures and disbands (disabled)',