feat(rust): the kit weekend, linked rewards, reward messages and the kit warning (protocol 14)

PLAN_REDESIGNS §2, the Rust half (D164, D192, D332, D333):
- rust.template.kit_weekend (core registerEventTemplates, MODULE_API 1.13.0):
  inputs kit/minutes/message/delivery; one phase advance after the weekend,
  core.lease rust.group.permission default/<kit permission> + rust.kit.entitle
  linked. Steps only where the kit can use them; validated by the real core.
- rust.kit.entitle: recipients 'linked' (every linked player who has played
  on the server, no tally, refused past the bound), optional message ({kit})
  and delivery, stored per row (rust_perm_run_grants.notice*).
- perm.sync notices: the untold set to the picked account, keyed
  run:step:user, in the digest; the report's noticesTold marks them told.
- rust.options.grouppermissions notes a kit's permission rows via kits.uses
  (cached a minute per server; a failure is no note).
- duration: 'minutes' on rust.zone.open and rust.participation.open; the
  group-permission lease's value example is true.
- protocol 13 -> 14, coreApi ^1.13.0; ci/core-ref.json pinned to website#212's
  head while it is open; engagement-triggers.json regenerated (coreApi line).

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

server/db/schema.sql

@@ -857,6 +857,16 @@ CREATE TABLE IF NOT EXISTS rust_perm_run_grants (
     FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
+-- The reward's message to its player (protocol 14, PLAN_REDESIGNS.md §2.4,
+-- D333): "You earned kit vip — type /kit vip", said once in game, at once or
+-- when they next wake. NULL `notice` is a reward that says nothing, which is
+-- every row written before this. `notice_told_at` is set when the plugin
+-- reports the player was told; until then every sync carries it. A withdrawn
+-- reward deletes its row, and its untold message goes with it.
+ALTER TABLE rust_perm_run_grants ADD COLUMN IF NOT EXISTS notice VARCHAR(300) NULL;
+ALTER TABLE rust_perm_run_grants ADD COLUMN IF NOT EXISTS notice_delivery VARCHAR(8) NULL;
+ALTER TABLE rust_perm_run_grants ADD COLUMN IF NOT EXISTS notice_told_at DATETIME NULL;
+
 -- The news switch (D104): whether a published news post is also said in this
 -- server's chat. Off, because core enqueues every registered leg for every
 -- post, and without it the day this module updates every post would start