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

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

tools/extract/tests/test_coords.py

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+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)

tools/extract/tests/test_tiles.py

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+import numpy as np
+from leonida.tiles import assemble
+
+def fake_tile(row: int, col: int) -> np.ndarray:
+    # Jede Kachel einfarbig, Farbe kodiert Zeile und Spalte.
+    return np.full((256, 256, 3), (row, col, 7), dtype=np.uint8)
+
+def test_assemble_crops_to_slice():
+    mosaic = assemble(fake_tile)
+    assert mosaic.shape == (3000, 3000, 3)
+    # Nordwest-Ecke stammt aus Kachel (54, 60)
+    assert tuple(mosaic[0, 0]) == (54, 60, 7)
+    # Südost-Ecke stammt aus Kachel (65, 71)
+    assert tuple(mosaic[-1, -1]) == (65, 71, 7)