Add editable weather captions and manage Threads scheduling with PM2

tests/threads-captions.test.ts

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+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { loadCaptions, weatherKey, renderCaption } from '../server/threads/captions.ts';
+
+const sample = { cloudCover: 10, visibility: 10000, rain: 0, snowfall: 0 };
+test('caption weather uses precipitation first and does not assume missing data means clear', () => {
+  const config = loadCaptions();
+  assert.equal(weatherKey({ ...sample, rain: 1, snowfall: 1 }, config), 'snow');
+  assert.equal(weatherKey({ ...sample, rain: 1, visibility: 100 }, config), 'rain');
+  assert.equal(weatherKey({ ...sample, visibility: 500 }, config), 'fog');
+  assert.equal(weatherKey({ ...sample, cloudCover: 90 }, config), 'cloudy');
+  assert.equal(weatherKey({ ...sample, cloudCover: 50 }, config), 'partlyCloudy');
+  assert.equal(weatherKey(sample, config), 'clear');
+  assert.equal(weatherKey(null, config), 'unknown');
+  assert.equal(weatherKey({ ...sample, rain: null }, config), 'unknown');
+});
+
+test('editable caption expands Korean date/time and test marker without publishing', () => {
+  const config = loadCaptions();
+  config.template = ['{message}', '{date} {time} / {sunrise}', '{url}'];
+  config.messages.rain = ['비 오는 날이야 ☔'];
+  const result = renderCaption(config, { weather: { ...sample, rain: 1 }, capturedAt: '2026-11-01T18:00:00Z',
+    sunrise: '2026-11-01T21:53:00Z', url: 'https://sunrise.horoli.kr', test: true });
+  assert.ok(result.text.includes('비 오는 날이야 ☔'));
+  assert.ok(result.text.includes('2026-11-02 03:00 / 06:53'));
+  assert.ok(result.text.startsWith(config.testPrefix));
+  assert.equal(result.condition, 'rain');
+});

tests/threads-schedule.test.ts

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+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { nextRunAt } from '../server/threads/schedule.ts';
+
+test('PM2 scheduler prepares at 03:00 Korea time regardless of host timezone', () => {
+  assert.equal(nextRunAt(new Date('2026-11-01T17:00:00Z')).toISOString(), '2026-11-01T18:00:00.000Z');
+  assert.equal(nextRunAt(new Date('2026-11-01T20:00:00Z')).toISOString(), '2026-11-01T20:00:00.000Z');
+  assert.equal(nextRunAt(new Date('2026-11-01T20:00:00Z'), '2026-11-02').toISOString(), '2026-11-02T18:00:00.000Z');
+  assert.equal(nextRunAt(new Date('2026-12-31T20:00:00Z'), '2027-01-01').toISOString(), '2027-01-01T18:00:00.000Z');
+});