chore(intro): final city fetch scripts (Overpass fallback endpoints)

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01KqP857pippaUs6konSDfe8

intro-sequence/tools/city/fetch_osm.py

@@ -394,7 +394,7 @@ def nyc_extra(slug, F):
         print(f"   {p['kind']:9s} {p['x']:8.1f} {p['y']:8.1f} {'in ' if p['inside'] else 'OUT'} {p['name']}")
     found = {k: [p for p in pads if p['kind'] == 'heliport' and k.split()[0].lower() in p['name'].lower()
                  and 'heliport' in p['name'].lower()] for k in KNOWN_HELI}
-    helipads = [[p['x'], p['y'], p['name'] or p['kind']] for p in pads]
+    helipads = [[p['x'], p['y'], p['name'] or (f"{p['kind']} {p['ref']}".strip())] for p in pads]
     write_json(os.path.join(OUT, slug, 'extra.json'),
                {'helipads': helipads,
                 'detail': pads,

intro-sequence/tools/city/geo.py

@@ -221,8 +221,8 @@ def clip_polyline(pts, xmin, ymin, xmax, ymax):
                 pieces.append(cur)
                 cur = []
             continue
-        a = (x1 + t0 * dx, y1 + t0 * dy)
-        b = (x1 + t1 * dx, y1 + t1 * dy)
+        a = (x1, y1) if t0 == 0.0 else (x1 + t0 * dx, y1 + t0 * dy)
+        b = (x2, y2) if t1 == 1.0 else (x1 + t1 * dx, y1 + t1 * dy)
         if not cur:
             cur = [a, b]
         else: