Turn the game into a third-person Mashhad city game

Replace the linear forest walk with an open area of real western Mashhad
built from OpenStreetMap data, starting at Park Mellat. A father and child,
guided by the Robot Market robot, find vending machines at a park, school,
universities, a metro station and a mall, on foot or by car.

- Iran province briefing map; only Mashhad is unlocked
- Third-person camera, building collision, arcade car and ambient traffic
- Minimap and full city map with addresses, opening hours and A* routing
- Purchase scoring, missions with cash rewards, ranks and an end screen
- Map data build script (OSM + Natural Earth) and new logic tests

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/scoring.test.js

@@ -0,0 +1,39 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import {awardsFor, rankFor, completeMissions, activeMission, POINTS, RANKS} from '../src/scoring.js';
+import {createState, purchase} from '../src/game-state.js';
+import {machineById} from '../src/locations.js';
+
+const total = awards => awards.reduce((s, a) => s + a.points, 0);
+
+test('Discovery, combo and all-category bonuses are paid once', () => {
+    const state = createState(), park = machineById('mellat-park');
+    const buy = (machine, product) => {
+        const before = state.purchases.slice();
+        return awardsFor(before, purchase(state, machine, product));
+    };
+    assert.equal(total(buy(park, 'water')), POINTS.purchase + POINTS.discovery);
+    assert.equal(total(buy(park, 'juice')), POINTS.purchase, 'same type: no combo');
+    assert.equal(total(buy(park, 'cake')), POINTS.purchase + POINTS.combo);
+    assert.equal(total(buy(park, 'water')), POINTS.purchase, 'combo only once');
+    buy(machineById('school-rahil'), 'water');
+    buy(machineById('ferdowsi-university'), 'water');
+    buy(machineById('azadi-metro'), 'water');
+    state.minutes = 11 * 60;
+    const last = buy(machineById('mashhad-mall'), 'water');
+    assert.ok(last.some(a => a.points === POINTS.allCategories));
+});
+
+test('Ranks and missions advance with progress', () => {
+    assert.equal(rankFor(0).name, RANKS[0].name);
+    assert.equal(rankFor(RANKS[1].xp).index, 1);
+    assert.equal(rankFor(1e6).progress, 1);
+    const state = createState();
+    assert.equal(activeMission(state).id, 'first');
+    purchase(state, machineById('mellat-park'), 'water');
+    const done = completeMissions(state);
+    assert.deepEqual(done.map(m => m.id), ['first']);
+    assert.equal(state.balance, 500 - 15 + 30);
+    assert.deepEqual(completeMissions(state), [], 'rewards are not repeated');
+    assert.equal(activeMission(state).id, 'school');
+});