Add sunrise Threads automation and improve capture and character interactions

tests/arrival.test.ts

@@ -0,0 +1,15 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { calculateSun, sunriseAzimuth } from '../src/astronomy/sunCalculator.ts';
+import { observer } from '../src/config/observer.ts';
+
+test('arrival faces the selected day’s sunrise, even when entering in the afternoon', () => {
+  for (const month of ['01', '06', '11']) {
+    const date = new Date(`2026-${month}-02T15:00:00+09:00`);
+    const state = calculateSun(date, observer);
+    const heading = sunriseAzimuth(date, observer);
+    assert.equal(heading, calculateSun(state.sunrise!, observer).azimuth);
+    assert.ok(heading > 45 && heading < 135);
+    assert.ok(Math.abs(heading - state.azimuth) > 60);
+  }
+});