Art: emit the palette as .gpl/.ase/.aco as well as .act

The .act files only helped Photoshop. Affinity imports .ase and .aco;
Inkscape, GIMP, Krita and Aseprite want .gpl. tools/make_palettes.py now
generates all four plus swatch PNGs, for both the full 16 and the
11-colour portrait subset, all derived from the same PALETTE table shared
with kissaten.c so nothing can drift.

Colour names ride along in .gpl/.ase/.aco, so the swatches show up labelled
("skin", "lamp glow", "dusk violet") rather than as anonymous chips.

.ase output verified by reading it back and checking all 11 colours
round-trip exactly.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

projects/kissaten_yugure/art/kissaten-full.gpl

@@ -0,0 +1,20 @@
+GIMP Palette
+Name: Kissaten Yugure (full)
+Columns: 16
+#
+  0   0   0	transparent
+ 36  36  36	outline
+ 73  36  36	dark wood
+146  73  36	mid wood
+182 109  73	light wood
+255 182  73	lamp glow
+255 219 146	cream
+109  73  73	muted wall
+ 73  36 146	dusk deep
+146  73 182	dusk violet
+219 109 109	dusk rose
+255 146  73	horizon amber
+109  36   0	coffee
+ 73 109 182	coat blue
+255 182 146	skin
+255 255 219	warm white

projects/kissaten_yugure/art/kissaten-portrait.gpl

@@ -0,0 +1,15 @@
+GIMP Palette
+Name: Kissaten Yugure (portrait)
+Columns: 11
+#
+ 36  36  36	outline
+ 73  36  36	dark wood
+146  73  36	mid wood
+182 109  73	light wood
+255 182  73	lamp glow
+255 219 146	cream
+109  73  73	muted wall
+109  36   0	coffee
+ 73 109 182	coat blue
+255 182 146	skin
+255 255 219	warm white

projects/kissaten_yugure/tools/make_palettes.py

@@ -0,0 +1,87 @@
+#!/usr/bin/env python3
+"""Emit the Kissaten palette in every format the art tools want.
+
+    python3 tools/make_palettes.py
+
+  .gpl  GIMP / Inkscape / Krita / Aseprite
+  .ase  Affinity (Photo, Designer, Publisher), Illustrator
+  .aco  Affinity, Photoshop
+  .act  Photoshop indexed-colour tables
+  .png  16x1 exact + a swatch strip, and a palette reference for generators
+
+Two sets are written: the full 16 (scene work) and the 11-colour portrait
+subset with the sky slots and the transparent index removed.
+"""
+import struct, os, sys
+
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+from pixtool import PALETTE, write_png
+
+NAMES = ["transparent", "outline", "dark wood", "mid wood", "light wood",
+         "lamp glow", "cream", "muted wall", "dusk deep", "dusk violet",
+         "dusk rose", "horizon amber", "coffee", "coat blue", "skin",
+         "warm white"]
+PORTRAIT_IDX = [1, 2, 3, 4, 5, 6, 7, 12, 13, 14, 15]
+OUT = os.path.join(os.path.dirname(os.path.abspath(__file__)), "..", "art")
+
+
+def gpl(path, cols, names, title):
+    L = [f"GIMP Palette", f"Name: {title}", f"Columns: {len(cols)}", "#"]
+    for c, n in zip(cols, names):
+        L.append(f"{c[0]:3d} {c[1]:3d} {c[2]:3d}\t{n}")
+    open(path, "w").write("\n".join(L) + "\n")
+
+
+def ase(path, cols, names):
+    blocks = b""
+    for c, n in zip(cols, names):
+        nm = n.encode("utf-16-be") + b"\x00\x00"
+        body = (struct.pack(">H", len(n) + 1) + nm + b"RGB "
+                + struct.pack(">fff", c[0] / 255, c[1] / 255, c[2] / 255)
+                + struct.pack(">H", 2))          # 2 = normal colour
+        blocks += struct.pack(">HI", 0x0001, len(body)) + body
+    open(path, "wb").write(b"ASEF" + struct.pack(">HHI", 1, 0, len(cols)) + blocks)
+
+
+def aco(path, cols, names):
+    # v1 then v2 concatenated — v1 for old readers, v2 carries the names
+    v1 = struct.pack(">HH", 1, len(cols))
+    for c in cols:
+        v1 += struct.pack(">HHHHH", 0, c[0] * 257, c[1] * 257, c[2] * 257, 0)
+    v2 = struct.pack(">HH", 2, len(cols))
+    for c, n in zip(cols, names):
+        v2 += struct.pack(">HHHHH", 0, c[0] * 257, c[1] * 257, c[2] * 257, 0)
+        v2 += struct.pack(">I", len(n) + 1) + n.encode("utf-16-be") + b"\x00\x00"
+    open(path, "wb").write(v1 + v2)
+
+
+def act(path, cols):
+    d = bytearray()
+    for c in cols:
+        d += bytes(c)
+    d += bytes(768 - len(d))
+    open(path, "wb").write(bytes(d))
+
+
+def swatches(path, cols, sw=32, h=64):
+    write_png(path, [[c for c in cols for _ in range(sw)]] * h)
+
+
+def emit(stem, idx, title):
+    cols = [PALETTE[i] for i in idx]
+    names = [NAMES[i] for i in idx]
+    p = lambda ext: os.path.normpath(os.path.join(OUT, f"{stem}.{ext}"))
+    gpl(p("gpl"), cols, names, title)
+    ase(p("ase"), cols, names)
+    aco(p("aco"), cols, names)
+    act(p("act"), cols)
+    swatches(p("png"), cols)
+    print(f"{stem}: {len(cols)} colours -> .gpl .ase .aco .act .png")
+
+
+if __name__ == "__main__":
+    emit("kissaten-full", list(range(16)), "Kissaten Yugure (full)")
+    emit("kissaten-portrait", PORTRAIT_IDX, "Kissaten Yugure (portrait)")
+    # exact 1px-per-entry image, for generators that take a palette image
+    write_png(os.path.normpath(os.path.join(OUT, "palette.png")), [list(PALETTE)])
+    print("palette.png: 16x1 exact")