feat(editor): add --gen-mesh-stove pot-bellied wood stove

85th procedural mesh primitive. Two-cylinder pot-bellied
stove silhouette:

  • body — wide round Y-axis cylinder (the stove body that
    holds the firebox)
  • chimney — thin tall Y-axis cylinder rising from the top
    of the body (the smoke vent)

Distinct from --gen-mesh-forge (square stone hearth + hood
+ chimney) and --gen-mesh-chimney (just the rectangular
shaft) — stove is the round-cylinder home / workshop
variant for cottages, smithies, alchemist labs, ranger
huts, dwarven mead-hall corner heaters.

Validates that chimneyR < bodyR so the silhouette always
reads as a wider-bottom-with-thinner-stack shape rather
than a flat tube.

Watertight under weld (verified 192 manifold edges, 0
boundary, 0 non-manifold).

tools/editor/cli_help.cpp

@@ -330,6 +330,8 @@ void printUsage(const char* argv0) {
     std::printf("                         Standing torch: tall thin post + wider fire-bowl on top (hall lining / dungeon entry / ceremony path)\n");
     std::printf("  --gen-mesh-scroll-case <wom-base> [bodyR] [bodyH] [capR] [capH] [sides]\n");
     std::printf("                         Scroll case: thin tall cylinder + optional wider cap (set capR=0 to skip) — libraries / mage scenes\n");
+    std::printf("  --gen-mesh-stove <wom-base> [bodyR] [bodyH] [chimneyR] [chimneyH] [sides]\n");
+    std::printf("                         Pot-bellied stove: round cylindrical body + thin chimney column on top (cottage / workshop heating)\n");
     std::printf("  --gen-camp-pack <outDir>\n");
     std::printf("                         Convenience: emit tent + firepit + bedroll + canopy + woodpile + haystack into outDir as 6 .wom files\n");
     std::printf("  --gen-blacksmith-pack <outDir>\n");