feat(rust): permissions as event rewards — lend or give any registered permission (PLAN_REDESIGNS §12)

D342-D346 (docs#342). Two steps over the permission mirror's own tables, so
no plugin, sidecar or protocol change:

- rust.perm.lend, "Permissions until the event ends": a kit reward's lease,
  one rust_perm_run_grants row per recipient per permission, the message on
  one row each; change/ledger with rust.kit.entitle's revert and reconcile;
  budget rust.permissions.
- rust.perm.give, "Permissions for good": a standing rust_perm_grants row per
  website user per permission, scoped to the step's server, source `event`,
  note "event run <run>, step <step>"; a grant already there is left alone,
  and a retry's own grants are counted as given; the message rides a
  notice-only run-grant row; irreversible/none; budget rust.permissions.kept.
- Both: several permissions through core's `multiple` param (MODULE_API
  1.14.0, at most 10); a required "I am sure" toggle refused unticked in the
  dry run and at run time, naming the permissions (D343); a permission the
  server's catalogue lacks refused by name; a blank message tells nobody.
- rust.options.permissions: the enabled servers' catalogues, grouped by the
  registering plugin (by prefix when none), sorted plugin then permission
  without case, a row noted "Only on X" when not on every server.
- Permission manager: an event-given grant shows "given by event run N,
  step M"; staff turn it off like any grant.
- coreApi ^1.14.0; ci/core-ref.json pinned to website#213's head until it
  merges; engagement-triggers.json regenerated; routes.manifest.json
  unchanged (no new routes).

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

server/eventRewards.js

@@ -1391,6 +1391,13 @@ module.exports = {
   ACTIONS,
   LEG,
   OPTION_SOURCES,
+  MODES,
+  PERMANENT,
+  oneOf,
+  peopleOf,
+  usersFor,
+  readTally,
+  entitlementRef,
   pickRecipients,
   checkCount,
   splitKit,