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/ui/settings_panel.gd

@@ -22,6 +22,11 @@ var _font_scale_value: Label = null
 var _invert_y: CheckButton = null
 var _head_bob: CheckButton = null
 var _difficulty: OptionButton = null
+var _master: HSlider = null
+var _sfx: HSlider = null
+var _ambience: HSlider = null
+var _reduce_motion: CheckButton = null
+var _captions: CheckButton = null
 var _bind_buttons := {}
 var _listening_action := ""
 var settings: Dictionary = {}
@@ -101,6 +106,27 @@ func _build() -> void:
 	_difficulty.item_selected.connect(_on_difficulty_selected)
 	diff_row.add_child(_difficulty)
 
+	var audio_row := HBoxContainer.new()
+	column.add_child(audio_row)
+	audio_row.add_child(_volume_label("Master volume"))
+	_master = _add_slider(audio_row, 0.0, 1.0, 0.05)
+	audio_row.add_child(_volume_label("SFX"))
+	_sfx = _add_slider(audio_row, 0.0, 1.0, 0.05)
+	audio_row.add_child(_volume_label("Ambience"))
+	_ambience = _add_slider(audio_row, 0.0, 1.0, 0.05)
+	_master.value_changed.connect(func(v): settings["master_volume"] = v)
+	_sfx.value_changed.connect(func(v): settings["sfx_volume"] = v)
+	_ambience.value_changed.connect(func(v): settings["ambience_volume"] = v)
+
+	_reduce_motion = CheckButton.new()
+	_reduce_motion.text = "Reduce motion"
+	_reduce_motion.toggled.connect(func(v): settings["reduce_motion"] = v)
+	column.add_child(_reduce_motion)
+	_captions = CheckButton.new()
+	_captions.text = "Captions / subtitles"
+	_captions.toggled.connect(func(v): settings["captions_enabled"] = v)
+	column.add_child(_captions)
+
 	var replay_row := HBoxContainer.new()
 	replay_row.alignment = BoxContainer.ALIGNMENT_CENTER
 	column.add_child(replay_row)
@@ -165,6 +191,13 @@ func _add_label_row(parent: Control, text: String) -> Label:
 	row.add_child(value)
 	return value
 
+func _volume_label(text: String) -> Label:
+	var label := Label.new()
+	label.text = text
+	label.add_theme_font_size_override("font_size", 11)
+	label.custom_minimum_size = Vector2(82, 0)
+	return label
+
 func _add_slider(parent: Control, min_v: float, max_v: float, step: float) -> HSlider:
 	var slider := HSlider.new()
 	slider.min_value = min_v
@@ -189,6 +222,16 @@ func open(current: Dictionary) -> void:
 	if _difficulty:
 		var difficulty := str(settings.get("ai_difficulty", "normal"))
 		_difficulty.select(["easy", "normal", "hard"].find(difficulty))
+	if _master:
+		_master.set_value_no_signal(float(settings.get("master_volume", 1.0)))
+	if _sfx:
+		_sfx.set_value_no_signal(float(settings.get("sfx_volume", 1.0)))
+	if _ambience:
+		_ambience.set_value_no_signal(float(settings.get("ambience_volume", 1.0)))
+	if _reduce_motion:
+		_reduce_motion.set_pressed_no_signal(bool(settings.get("reduce_motion", false)))
+	if _captions:
+		_captions.set_pressed_no_signal(bool(settings.get("captions_enabled", true)))
 	_listening_action = ""
 	_refresh_bind_buttons()
 	_sync_labels()