feat(editor): add --gen-texture-scales overlapping-circle pattern

33rd procedural texture: fish / dragon / chain mail scales done
as a half-row-staggered grid of circles whose centers sit at the
bottom-center of each cell. Adjacent rows offset by half a cell
width, with circle radius slightly larger than half the cell, so
the circles interlock into the classic overlapping-scale look.

Three colors: background fills the gaps, scale body fills most of
each circle, and a rim color highlights the top arc to give the
raised / armored feel.

Defaults to 24×16 cells; scaled by cellW × cellH for fine control
of scale density. Useful for chain mail, dragonhide, fish skin,
roof shingles, anywhere needing tiled curved scales.

tools/editor/cli_help.cpp

@@ -99,6 +99,8 @@ void printUsage(const char* argv0) {
     std::printf("                         Argyle: 45-rotated lozenge checkerboard with diagonal stitch lines (sweater knit)\n");
     std::printf("  --gen-texture-herringbone <out.png> <bgHex> <lineHex> [stripH] [lineSpacing] [lineWidth] [W H]\n");
     std::printf("                         Herringbone: slanted parallel lines that flip direction every strip (chevron / fish-bone)\n");
+    std::printf("  --gen-texture-scales <out.png> <bgHex> <scaleHex> <rimHex> [cellW] [cellH] [W H]\n");
+    std::printf("                         Scales: half-row-staggered overlapping circles forming fish/dragon/chain-mail look\n");
     std::printf("  --add-texture-to-zone <zoneDir> <png-path> [renameTo]\n");
     std::printf("                         Copy an existing PNG into <zoneDir> (optionally renaming it on the way in)\n");
     std::printf("  --gen-mesh <wom-base> <cube|plane|sphere|cylinder|torus|cone|ramp> [size]\n");