Chainbreaker: rare, very strong original creature (twin-axe cleave, restless without fights)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/gfx.rs

@@ -675,6 +675,19 @@ fn sprite_rows(k: EK) -> [&'static str; 10] {
             ".kRRRRRRk.",
             "..kkkkkk..",
         ],
+        // obsidian demon with glowing cracks, broken chains and twin axes
+        EK::Chainbreaker => [
+            "s.kkkkkk.s",
+            "sskdoodkss",
+            ".SkeddekS.",
+            ".SkdoodkS.",
+            "kdddoodddk",
+            "kdoddddodk",
+            "SkddooddkS",
+            ".kddddddk.",
+            ".kdok.odk.",
+            ".kkk..kkk.",
+        ],
         EK::Paladin => [
             "...kkkk..w",
             "..kyyyyk.w",
@@ -714,13 +727,14 @@ fn pal(ch: char) -> Option<Color> {
         'C' => c(96, 98, 92),
         'o' => c(226, 124, 48),
         'O' => c(160, 72, 24),
+        'd' => c(44, 36, 48),
         _ => return None,
     })
 }
 
-pub const SPRITE_KINDS: [EK; 12] = [EK::Worker, EK::Kobold, EK::Spider, EK::Mage, EK::Ogre, EK::Knight, EK::Archer, EK::Priest, EK::Dwarf, EK::Paladin, EK::Jailer, EK::Priestess];
+pub const SPRITE_KINDS: [EK; 13] = [EK::Worker, EK::Kobold, EK::Spider, EK::Mage, EK::Ogre, EK::Knight, EK::Archer, EK::Priest, EK::Dwarf, EK::Paladin, EK::Jailer, EK::Priestess, EK::Chainbreaker];
 // width of the sprite texture in pixels
-pub const SPRITE_TEX_W: f32 = (12 * 12) as f32;
+pub const SPRITE_TEX_W: f32 = (13 * 12) as f32;
 pub const SPRITE_TEX_H: f32 = 24.0;
 
 pub fn sprite_index(k: EK) -> u32 {