feat(events): an event action's progress() on a live run's public page (MODULE_API 1.12.0)

An event action may declare an optional `progress(envelope)`: how its
step stands while the run is live. Core accepts two shapes and
interprets neither:

- a count: { label, left, of }, rendered "Bandits: 3 of 8 left";
- a percentage: { label, percent }, rendered "The Juggernaut: 62%".

How core asks:

- `events/progress.js` asks each step of a live run whose action has
  one. It passes the step's own held ledger rows and the reader's
  account id, so the module applies its own visibility.
- Each call has a 2 s deadline. A throw, a late answer or any other
  shape is a line not shown, never an error on the page.
- One answer per run and reader is cached for 5 s.
- The public event's live occurrence carries the lines as `progress`.
  The route takes an optional session for the reader.
- The page renders them under the phase label and re-reads them every
  15 s while the event is live.

Core stays game-agnostic: no game's words are in it. Additive, so a
minor bump. Module-uo declares ^1.10.0, registers no action with
progress(), and its actions and pages are unchanged.

From RunicNPC stage 8 (D304, D305).

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

client/test/eventCalendar.test.js

@@ -9,7 +9,7 @@
 
 import { test } from 'node:test'
 import assert from 'node:assert/strict'
-import { eventTime, eventDateTime, readerDayLabel, statusWord } from '../src/lib/eventCalendar.js'
+import { eventTime, eventDateTime, readerDayLabel, statusWord, progressText } from '../src/lib/eventCalendar.js'
 
 // 2026-09-12T00:00Z is 2026-09-11 20:00 in New York — deliberately an instant
 // whose DATE differs between the two zones, which is what makes the split
@@ -87,3 +87,11 @@ test('the other three words do not depend on the clock at all', () => {
 test('an unreadable instant falls to the past-tense word rather than throwing', () => {
   assert.equal(statusWord('cancelled', 'not a date', NOW), 'Did not happen')
 })
+
+test('a progress line is a count or a percent, and nothing else renders (MODULE_API 1.12.0)', () => {
+  assert.equal(progressText({ label: 'Bandits', left: 3, of: 8 }), 'Bandits: 3 of 8 left')
+  assert.equal(progressText({ label: 'The Juggernaut', percent: 62 }), 'The Juggernaut: 62%')
+  assert.equal(progressText({ label: 'Odd' }), '')
+  assert.equal(progressText({ left: 1, of: 2 }), '')
+  assert.equal(progressText(null), '')
+})