feat(websocket): add WebSocket display backend for browser client

engine/config.py

@@ -127,6 +127,9 @@ class Config:
 
     script_fonts: dict[str, str] = field(default_factory=_get_platform_font_paths)
 
+    websocket: bool = False
+    websocket_port: int = 8765
+
     @classmethod
     def from_args(cls, argv: list[str] | None = None) -> "Config":
         """Create Config from CLI arguments (or custom argv for testing)."""
@@ -164,6 +167,8 @@ class Config:
             glitch_glyphs="░▒▓█▌▐╌╍╎╏┃┆┇┊┋",
             kata_glyphs="ﾊﾐﾋｰｳｼﾅﾓﾆｻﾜﾂｵﾘｱﾎﾃﾏｹﾒｴｶｷﾑﾕﾗｾﾈｽﾀﾇﾍ",
             script_fonts=_get_platform_font_paths(),
+            websocket="--websocket" in argv,
+            websocket_port=_arg_int("--websocket-port", 8765, argv),
         )
 
 
@@ -223,6 +228,10 @@ GRAD_SPEED = 0.08  # gradient traversal speed (cycles/sec, ~12s full sweep)
 GLITCH = "░▒▓█▌▐╌╍╎╏┃┆┇┊┋"
 KATA = "ﾊﾐﾋｰｳｼﾅﾓﾆｻﾜﾂｵﾘｱﾎﾃﾏｹﾒｴｶｷﾑﾕﾗｾﾈｽﾀﾇﾍ"
 
+# ─── WEBSOCKET ─────────────────────────────────────────────
+WEBSOCKET = "--websocket" in sys.argv
+WEBSOCKET_PORT = _arg_int("--websocket-port", 8765)
+
 
 def set_font_selection(font_path=None, font_index=None):
     """Set runtime primary font selection."""