Remove constellation artwork, keep line traces only

Drops the 12 zodiac PNGs, their loader/similarity-transform renderer and
the art anchors in constellations.js; build_constellations.py no longer
emits art data. Constellation mode now shows just the Stellarium traces,
labels and stars.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015HtPHsTnDcLVSCiF5FGHZj

tools/build_constellations.py

@@ -93,27 +93,12 @@ def main() -> None:
             if missing:
                 raise RuntimeError(f"{ident}: HIP ausente no catálogo: {missing}")
             lines.append([stars[hip] for hip in hip_line])
-        image = constellation.get("image")
-        art = None
-        if image:
-            anchors = []
-            for anchor in image["anchors"]:
-                hip = int(anchor["hip"])
-                if hip not in stars:
-                    raise RuntimeError(f"{ident}: âncora HIP ausente: {hip}")
-                anchors.append({"pos": anchor["pos"], "sky": stars[hip]})
-            art = {
-                "file": "constellation-art/" + Path(image["file"]).name,
-                "size": image["size"],
-                "anchors": anchors,
-            }
         merged[ident] = {
             "id": ident,
             "name": ZODIAC[ident],
             "rank": 1 if ident in {"Ari", "Tau", "Gem", "Leo", "Vir", "Sco", "Sgr"} else 2,
             "label": metadata.get(ident, {}).get("label"),
             "lines": lines,
-            "art": art,
         }
 
     payload = json.dumps(