Consolidate MangaCircus app, scraper, and Compose baseline

sentinel/test/monitor.test.js

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+'use strict';
+const test = require('node:test'), assert = require('node:assert/strict');
+const { Monitor } = require('../monitor');
+test('Sentinel does not disturb progressing or deliberately paused jobs', async () => {
+  let now = 0, recoveries = 0;
+  const monitor = new Monitor({ now: () => now, stallMs: 100 });
+  const state = { paused: false, active: [{ source: 'a', current: { id: 'job', title: 'Manga' }, job: { completed: 0, current: { downloadedPages: 1 } } }], queue: [] };
+  const recover = async () => { recoveries++; return { changed: true }; };
+  await monitor.observe({ ok: true }, state, recover);
+  now = 500000; state.active[0].job.current.downloadedPages = 2;
+  await monitor.observe({ ok: true }, state, recover);
+  now = 1000000; state.paused = true;
+  await monitor.observe({ ok: true }, state, recover);
+  assert.equal(recoveries, 0);
+  state.paused = false; await monitor.observe({ ok: true }, state, recover); await monitor.observe({ ok: true }, state, recover);
+  assert.equal(recoveries, 1);
+  state.active[0].job.completed = 1; await monitor.observe({ ok: true }, state, recover);
+  assert.equal(monitor.incidents.find(i => i.key === 'stall:job').state, 'resolved');
+});
+test('Sentinel reports service failures without restart loops and resolves recovery', async () => {
+  const monitor = new Monitor();
+  await monitor.observe(null, null); await monitor.observe(null, null);
+  assert.equal(monitor.incidents.length, 2);
+  await monitor.observe({ ok: true }, { active: [], queue: [], paused: false });
+  assert.equal(monitor.state.status, 'healthy'); assert.ok(monitor.incidents.every(i => i.state === 'resolved'));
+});