Add OpenSeaMap / OpenSnowMap overlay layers (#10)

Two independently toggleable open-data raster overlays — OpenSeaMap
sea marks (buoys, lighthouses, ports) and OpenSnowMap ski pistes —
drawn as Cesium.ImageryLayers directly on the Cesium globe surface.
Same "small array of descriptors" shape as MAP_STACKS in
mapStackController.js.

Visible on the osm/bing-aerial/bing-labels map stacks and invisible
(not broken — the layer's stats say so in plain text) on the default
photoreal stack, since Google Photorealistic 3D Tiles render with the
globe hidden.

OpenRailwayMap and OpenInfraMap, also requested in #10, are
deliberately NOT included in this pass: OpenRailwayMap's public tile
server enforces a Referer allowlist scoped to its own site (confirmed
by direct request — every other Referer, including none, 403s), and
OpenInfraMap serves MapLibre GL vector tiles, not raster XYZ — that
would need a genuine vector-tile rendering pipeline, not a
Cesium.ImageryLayer drop-in. Worth its own dedicated pass.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
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Tom-NeverwinterandClaude Sonnet 5 committed 2026-09-12 17:07:33 -05:00
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@@ -155,8 +155,8 @@ function encode(state) {
test('production registry is exact, canonical, and rejects incomplete contracts', async () => {
assert.equal(validateLayerStateRegistry(), true);
assert.equal(REGISTERED_LAYER_IDS.length, 16);
assert.equal(new Set(REGISTERED_LAYER_IDS).size, 16);
assert.equal(REGISTERED_LAYER_IDS.length, 17);
assert.equal(new Set(REGISTERED_LAYER_IDS).size, 17);
assert.deepEqual(REGISTERED_LAYER_IDS, [...REGISTERED_LAYER_IDS].sort());
assert.throws(
() => validateLayerStateRegistry([...LAYER_STATE_REGISTRY, LAYER_STATE_REGISTRY[0]]),