Ship the 0.9.0 production-quality milestone

Add mixer/accessibility settings, caption/reduce-motion hooks, audio volume
clamping, a 24-NPC performance smoke and shortened coat/dress stride for hem
clipping. Record the explicit Godot 4.3-CI/4.7-local matrix and the 0.9
production scope. Headless 250/250, Python 94/94, 24-NPC budget smoke passes.

src/game/game_manager.gd

@@ -377,7 +377,10 @@ func _apply_settings(settings: Dictionary) -> void:
 	if guard:
 		guard.look_sensitivity = float(settings.get("look_sensitivity", 0.0022))
 		guard.invert_y = bool(settings.get("invert_y", false))
-		guard.head_bob_enabled = bool(settings.get("head_bob", true))
+		guard.head_bob_enabled = bool(settings.get("head_bob", true)) and not bool(settings.get("reduce_motion", false))
+	if audio:
+		audio.set_volumes(float(settings.get("master_volume", 1.0)),
+			float(settings.get("sfx_volume", 1.0)), float(settings.get("ambience_volume", 1.0)))
 	InputBindings.apply(settings.get("input_bindings", {}))
 	if hud and hud.has_method("set_font_scale"):
 		hud.set_font_scale(float(settings.get("hud_font_scale", 1.0)))