License under GPLv3

Add SPDX headers to the source, a License section to the README, the
OFL notice for the bundled fonts, and ship LICENSE in the Docker image.

webtest/camera.test.mjs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Copyright (C) 2026 Andy Dixon
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import { perspective, lookAt, multiply, transform, invert, orbitPose, ORBIT_FOV } from '../web/camera.js';

webtest/city.test.mjs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Copyright (C) 2026 Andy Dixon
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import { layoutCity, buildingHeight, spatialIndex, rayBox, pickRay, CITY } from '../web/city.js';

webtest/infrastructure.test.mjs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Copyright (C) 2026 Andy Dixon
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import { layoutCity, buildNavGrid, routesFrom, assignDoors, routeThroughDoors, ribbonVertices, streetFurniture, furnitureBoxes, walkable, DOOR, seededRandom, trafficLoops, spawnCars, carBoxes, carPose, stepCars, wallSigns } from '../web/city.js';

webtest/labels.test.mjs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Copyright (C) 2026 Andy Dixon
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import { ShelfPacker } from '../web/labels.js';

webtest/nav.test.mjs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Copyright (C) 2026 Andy Dixon
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import { buildNavGrid, routesFrom, walkable } from '../web/city.js';

webtest/people.test.mjs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Copyright (C) 2026 Andy Dixon
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import { personFor, residentSeed, NAMES, OCCUPATIONS, EMPLOYERS, BLOOD_TYPES, EYE_COLOURS, HAIR_COLOURS } from '../web/people.js';

webtest/place.test.mjs

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Copyright (C) 2026 Andy Dixon
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import { tourStops, encodePlace, decodePlace, joystick } from '../web/city.js';