Initial

tests/unit/geo.test.ts

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+import { describe, it, expect } from 'vitest';
+import { haversineMeters } from '$domain';
+
+describe('haversineMeters', () => {
+	it('is zero for identical points', () => {
+		expect(haversineMeters({ lat: 55, lon: 37 }, { lat: 55, lon: 37 })).toBe(0);
+	});
+	it('matches a known great-circle distance (London→Paris ≈ 343 km)', () => {
+		const d = haversineMeters({ lat: 51.5074, lon: -0.1278 }, { lat: 48.8566, lon: 2.3522 });
+		expect(d).toBeGreaterThan(340_000);
+		expect(d).toBeLessThan(346_000);
+	});
+});