fix(extract): Polygonlöcher im Chunk-Payload erhalten, split_by_chunk_all abdecken

Ruling 34 (Important, Fix-Runde 1 zu Aufgabe 6): _ring() verwarf jedes Loch
eines Polygons (nur poly.exterior wurde in Weltkoordinaten -> three.js
uebertragen). Vor dem Chunk-Zuschnitt war das meist harmlos, weil das
groesste Loch die Bucht selbst ist und beim Zuschneiden ohnehin herausfaellt
- danach blieb es aber ein echter Datenverlust: ein von Strassen umschlossener
Block wurde zu Asphalt, ein Innenhof zu Gebaeudemasse, ein Teich im Park zu
Wiese. Gemessen an echten Daten: 120 Strassen-Chunk-Stuecke (449.876 m2),
127 Stadtflaechen-Stuecke (208.657 m2 wobei 1 weiteres Park-Stueck), 30
Land-Stuecke (11.402 m2) und mindestens 75 Gebaeude-Stuecke trugen ein
verworfenes Loch.

_ring() wird _rings(): liefert [poly.exterior, *poly.interiors] in derselben
Transformation, Aussenring zuerst. Payload-Schema aendert sich entsprechend
fuer land/surfaces/roads/buildings von einem flachen Ring zu einer Liste von
Ringen; centerlines und palms sind unveraendert (keine Polygone). Task 7s
extrudePolygons() ruft ShapeUtils.triangulateShape(ring, []) bereits mit
einem (bisher leeren) Loecher-Array - die Aenderung passt jetzt durchgehend,
bevor Aufgabe 7 gebaut wird. write_debug_png() zeichnet weiterhin nur den
Aussenring (poly[0]), Loecher werden im Debug-Bild nicht dargestellt.

Neuer Test test_polygon_holes_survive_into_the_payload prueft das direkt an
einem Block mit Loch; die Koordinaten wurden vor dem Festschreiben gegen die
tatsaechliche chunk_payload()-Transformation nachgerechnet (uv run python,
nicht nur von Hand). test_coordinates_are_chunk_local_three_js musste auf
das neue [0]-Aussenring-Indexing angepasst werden.

Ruling 35 (Important): split_by_chunk_all() - die Variante, die run.py
tatsaechlich benutzt, nicht das getestete split_by_chunk() - hatte einen
MultiPolygon-Zweig ohne jede Testabdeckung. Neuer Test mit einer Klammerform
(Steg ausserhalb der Chunk-Zelle, zwei Zinken je einmal hineinreichend)
trifft genau diesen Zweig gezielt; er war schon vor der Aenderung gruen -
bestaetigt als Abdeckungsluecke, nicht als Bug.

uv run pytest -v: 36 passed (34 zuvor + 2 neu).

Pipeline (run.py) am gecachten Mosaik neu durchlaufen: weiterhin 144
Chunk-Dateien, public/data/vice-a/ jetzt 2,7 MB (zuvor 2,5 MB; +0,2 MB fuer
die erhaltenen Loecher). Insgesamt tragen jetzt 415 Chunk-Stuecke mindestens
ein Loch: Land 30/213, Stadtflaechen 127/1145 (+1 Park-Flaeche), Strassen
120/953, Gebaeude 137/2859 (80 global-eindeutige Gebaeude vor
Chunk-Duplizierung). Land/Strassen/Stadtflaechen treffen die oben genannten
Referenzwerte exakt; bei Gebaeuden weicht die Stueckzahl vom Review-Befund
(75) ab. Stichprobe der vier flaechenmaessig groessten Gebaeude-Loecher
(Debug-PNGs chunk_8_0, chunk_2_10, chunk_5_11 sowie ein viertes) zeigt
plausible echte Ring-Bauwerke (ein stadionartiger Rundbau, eine
Wendel-Parkrampe) statt offensichtlicher Fehlklassifikation - die
verbleibende Abweichung duerfte an der bereits im Task-6-Bericht
offengelegten Restunsicherheit der Gebaeude-Ueberlappungsrekonstruktion
liegen (263 vs. 258 spekulative Gebaeude), nicht an dieser Aenderung; im
Fix-Bericht dokumentiert.

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

public/data/vice-a/chunk_9_8.json

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