feat(editor): add --gen-texture-mesh-screen orthogonal grid

61st procedural texture: thin horizontal + vertical wires
forming an axis-aligned grid. Distinct from
--gen-texture-lattice (which uses ±45° diagonals to make
diamond openings) — this gives the right-angle window-
screen / chain-link / sci-fi-grille look.

Tested per-axis: a row is "on a wire" if (y % stride) <
wireW; a pixel falls on a wire if either its row OR its
column tests positive. Result is the unmistakable
orthogonal-mesh appearance.

Useful for window screens, anti-pest grates, fish nets,
sewer grilles, sci-fi vent panels, prison-cell windows,
goblin-workshop catwalks. Default 12-stride / 2-wide
gives a coarse mesh; finer versions read as bug screen.

tools/editor/cli_arg_required.cpp

@@ -94,6 +94,7 @@ const char* const kArgRequired[] = {
     "--gen-texture-moss", "--gen-texture-woodgrain",
     "--gen-texture-carbon", "--gen-texture-pinstripe",
     "--gen-texture-camo", "--gen-texture-snake-skin",
+    "--gen-texture-mesh-screen",
     "--validate-glb", "--info-glb", "--info-glb-tree", "--info-glb-bytes",
     "--validate-jsondbc", "--check-glb-bounds", "--validate-stl",
     "--validate-png", "--validate-blp",

tools/editor/cli_gen_texture.cpp

@@ -3546,6 +3546,58 @@ int handleKnit(int& i, int argc, char** argv) {
     return 0;
 }
 
+int handleMeshScreen(int& i, int argc, char** argv) {
+    // Orthogonal mesh-screen / grille: thin horizontal + vertical
+    // wires forming an axis-aligned grid. Distinct from
+    // --gen-texture-lattice (which uses ±45° diagonals to make
+    // diamond openings) — this is the right-angle window-screen /
+    // chain-link / sci-fi-grille look.
+    std::string outPath = argv[++i];
+    std::string bgHex   = argv[++i];
+    std::string wireHex = argv[++i];
+    int stride = 12;
+    int wireW  = 2;
+    int W = 256, H = 256;
+    parseOptInt(i, argc, argv, stride);
+    parseOptInt(i, argc, argv, wireW);
+    parseOptInt(i, argc, argv, W);
+    parseOptInt(i, argc, argv, H);
+    if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
+        stride < 2 || stride > 1024 ||
+        wireW < 1 || wireW * 2 >= stride) {
+        std::fprintf(stderr,
+            "gen-texture-mesh-screen: invalid dims (W/H 1..8192, "
+            "stride 2..1024, wireW 1..stride/2)\n");
+        return 1;
+    }
+    uint8_t br_, bg_, bb_, wr, wg, wb_;
+    if (!parseHexOrError(bgHex, br_, bg_, bb_,
+                         "gen-texture-mesh-screen")) return 1;
+    if (!parseHexOrError(wireHex, wr, wg, wb_,
+                         "gen-texture-mesh-screen")) return 1;
+    std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
+    for (int y = 0; y < H; ++y) {
+        bool yOnWire = (y % stride) < wireW;
+        for (int x = 0; x < W; ++x) {
+            bool xOnWire = (x % stride) < wireW;
+            uint8_t r, g, b;
+            if (xOnWire || yOnWire) {
+                r = wr; g = wg; b = wb_;
+            } else {
+                r = br_; g = bg_; b = bb_;
+            }
+            setPixelRGB(pixels, W, x, y, r, g, b);
+        }
+    }
+    if (!savePngOrError(outPath, W, H, pixels,
+                        "gen-texture-mesh-screen")) return 1;
+    std::printf("Wrote %s\n", outPath.c_str());
+    std::printf("  size       : %dx%d\n", W, H);
+    std::printf("  bg/wire    : %s / %s\n", bgHex.c_str(), wireHex.c_str());
+    std::printf("  grid       : stride=%d, wireW=%d\n", stride, wireW);
+    return 0;
+}
+
 int handleSnakeSkin(int& i, int argc, char** argv) {
     // Snake skin: brick-offset grid of diamond-shaped scales.
     // Each scale is a rotated square in L1 (taxicab) metric so
@@ -4527,6 +4579,7 @@ constexpr TextureEntry kTextureTable[] = {
     {"--gen-texture-pinstripe",      3, handlePinstripe},
     {"--gen-texture-camo",           3, handleCamo},
     {"--gen-texture-snake-skin",     3, handleSnakeSkin},
+    {"--gen-texture-mesh-screen",    3, handleMeshScreen},
 };
 }  // namespace
 

tools/editor/cli_help.cpp

@@ -155,6 +155,8 @@ void printUsage(const char* argv0) {
     std::printf("                         Camouflage: 2-octave value noise thresholded into hard bg/fg blobs (woodland disruption pattern)\n");
     std::printf("  --gen-texture-snake-skin <out.png> <bgHex> <scaleHex> [cellW] [cellH] [outlineW] [W H]\n");
     std::printf("                         Snake skin: brick-offset diamond scales (L1 metric) with derived dark outline (reptile / dragon hide)\n");
+    std::printf("  --gen-texture-mesh-screen <out.png> <bgHex> <wireHex> [stride] [wireW] [W H]\n");
+    std::printf("                         Mesh-screen: orthogonal H+V wire grid (window screen / chain-link / sci-fi grille)\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");