feat(extract): Koordinaten, Kachel-Download und Mosaik

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

tools/extract/tests/test_coords.py

@@ -0,0 +1,15 @@
+from leonida.coords import SLICE, pixel_to_world, slice_tiles, tile_for_world
+
+def test_tile_of_vice_beach():
+    assert tile_for_world(1409.4, 2803.2) == (53, 69)
+
+def test_slice_covers_expected_grid():
+    tiles = slice_tiles()
+    assert len(tiles) == 144
+    assert min(c for _, c in tiles) == 60 and max(c for _, c in tiles) == 71
+    assert min(r for r, _ in tiles) == 54 and max(r for r, _ in tiles) == 65
+
+def test_pixel_origin_is_slice_corner():
+    # Pixel (0,0) des beschnittenen Mosaiks ist die Nordwest-Ecke des Ausschnitts.
+    assert pixel_to_world(0, 0) == (SLICE["x0"], SLICE["y1"])
+    assert pixel_to_world(2999, 2999) == (SLICE["x0"] + 2999, SLICE["y1"] - 2999)