feat(events): a param that holds several values (MODULE_API 1.14.0)

Rust PLAN_REDESIGNS §12.3 (D344): an event action param may declare
`multiple: true`, with an optional `max` (1-100, 20 when left out), on a
`string` or `int` param. The permission reward steps take several permissions
in one step through it.

- registries: the flag and `max` are checked at registration and served in the
  catalog; refused on other types, on a duration, on a template's inputs, and
  with a list as the example. A param that does not say it reads back exactly
  as declared, without the keys.
- spec: the value is a JSON array, each item the type's literal, duplicates
  dropped in order, at most `max`; a bare value is a list of one; `required`
  means at least one; an empty item is refused.
- authorize: a multiple param's example is priced as a list of one, since
  cost() is handed the array.
- editor: a multi-select. Chips above a grouped, filterable checklist for a
  source that answered; the typeahead for a searchable source; a tag box
  otherwise. Ticking past max is refused in words. A new step holds the
  example as a list of one.
- run console: params read as `name: value`, a list joined by commas.
- MODULE_API 1.13.0 -> 1.14.0 on both halves; engagement-triggers.json and the
  catalog's OpenAPI note regenerated.

Additive only: Module-uo (`^1.10.0`) declares no multiple param.

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

client/src/routes/admin/views/EventRun.jsx

@@ -9,6 +9,7 @@ import {
   runControlsFor,
   stepControlsFor,
   describeLogLine,
+  describeParams,
 } from '../../../lib/eventAuthoring.js'
 
 // Admin → Events → the run console (EVENTS.md §I, Phase 3).
@@ -655,7 +656,7 @@ export default function EventRun() {
                   <td className="adm-td" style={{ fontSize: '0.82rem' }}>
                     <code style={{ fontSize: '0.78rem' }}>{step.actionId}</code>
                     <div className="dim" style={{ fontSize: '0.74rem', maxWidth: 320, overflowWrap: 'anywhere' }}>
-                      {JSON.stringify(step.params)}
+                      {describeParams(step.params)}
                     </div>
                   </td>
                   <td className="adm-td" style={{ fontSize: '0.82rem', color: STEP_COLOR[step.status] || undefined }}>