Release God's Eye View as open source

src/data/fixtures/README.md

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+# Test fixtures
+
+- `tomtom-flow-austin-12-935-1686.pbf` — one real TomTom traffic-flow vector
+  tile (Mapbox Vector Tile protobuf, layer `"Traffic flow"`), downtown Austin
+  z12 x935 y1686, captured 2026-07-16 from
+  `api.tomtom.com/traffic/map/4/tile/flow/relative/12/935/1686.pbf`
+  (22,980 bytes). Used ONLY by `src/data/flowTiles.test.mjs` to pin MVT
+  decoding offline — it is a point-in-time congestion snapshot, not a bundled
+  data layer, and is never served to the app. © TomTom.