Mythic Masters: builder fixes the second art pass hit (Nessie blend, feather tips, sphinx wings, tufts in blobs) #2795

Left over from the second art pass (#2779). Each one needs a builder change in apps/wildclash/blender/beast.py rather than a sheet edit:

• Nessie: blend breaks it. With blend at 0.03 or 0.02 the remesh drops the back legs and tail (feet 2/4). With bridge: true and blend 0.025 all four feet come back, but the body blob comes out cut square. Its sheet is unchanged.
• Feathers come out as spikes. A feather's tip radius is 0, so a row of them looks like a sawtooth (worst on the sphinx's upright wings). A wide or rounded tip option would fix it.
• Sphinx wings. Camber only helps a little. The rig finds no wings even with wings: 2, so the sheet says wings: 0 for now.
• Tufts sink into blobs. A tuft roots at the node's radius, so on a chain inside a big blob it's buried unless sink is set past 1 (1.1 to 1.4 was used on yeti, troll, mapinguari and the dogs). Rooting tufts on the blob's surface would remove the guesswork.
• Smaller misses: the rougarou's side tuft rows read as flaps from the front, and the wampus cat's ruff reads as a jagged collar.