Add accessibility pass: escalation meter and working HUD font scale

- Escalation cue now includes a shape meter and numeric level
  ("Escalation: Blocking [###--] L3/5") in addition to the colour and name, so it
  reads in grayscale. Hud.escalation_meter(level) is pure and tested.
- HUD font scale from settings actually works: set_font_scale() resizes fonts via
  theme overrides instead of Control.scale, which pushed the right-anchored clock
  label off-screen. It now covers the top, log, target, hint, time, mode,
  escalation, cooldown, and debug labels.
- Settings load before the HUD exists, so _ready() re-applies player settings after
  _build_ui(); previously a saved font scale was ignored until the next apply.

Tests/docs
- Headless suite 134 -> 139 (test_accessibility.gd).
- Verified visually at 1.4x scale: no overflow, meter readable.
- README, TODO section moved to DONE, MEMORY. Version 0.2.9.

src/game/ui/hud.gd

@@ -49,6 +49,8 @@ var _debug_enabled := false
 var _log_lines: Array[String] = []
 var _cam_overlay: Control = null
 var _body_camera_on := false
+var _font_scale := 1.0
+var _base_font_sizes: Dictionary = {}
 
 func _init() -> void:
 	name = "HUD"
@@ -300,16 +302,20 @@ func is_body_camera_on() -> bool:
 	return _body_camera_on
 
 ## Scale the whole HUD text block (accessibility settings).
+## Resize HUD text by changing font sizes (not Control.scale, which overflows
+## anchored labels and breaks the right-aligned layout).
 func set_font_scale(scale: float) -> void:
 	var clamped := clampf(scale, 0.75, 1.75)
-	if top_label:
-		top_label.scale = Vector2(clamped, clamped)
-	if log_label:
-		log_label.scale = Vector2(clamped, clamped)
-	if target_label:
-		target_label.scale = Vector2(clamped, clamped)
-	if hint_label:
-		hint_label.scale = Vector2(clamped, clamped)
+	_font_scale = clamped
+	var scaled: Array[Label] = [top_label, log_label, target_label, hint_label,
+		time_label, mode_label, escalation_label, radio_cooldown_label, debug_label]
+	for label in scaled:
+		if label == null:
+			continue
+		if not _base_font_sizes.has(label):
+			_base_font_sizes[label] = label.get_theme_font_size("font_size")
+		var base: int = int(_base_font_sizes[label])
+		label.add_theme_font_size_override("font_size", maxi(8, int(round(float(base) * clamped))))
 
 func _make_icon(texture: Texture2D) -> TextureRect:
 	var tr := TextureRect.new()
@@ -353,9 +359,18 @@ func set_action_hint(text: String) -> void:
 
 ## Color-coded escalation feedback (PLAN.md: Polish and Accessibility).
 ## Green → yellow → orange → red as the escalation level rises.
+## Grayscale-safe escalation meter: filled/empty blocks plus the level number, so
+## the cue does not rely on hue alone (accessibility).
+static func escalation_meter(level: int) -> String:
+	var clamped := clampi(level, 0, 5)
+	var filled := ""
+	for i in 5:
+		filled += "#" if i < clamped else "-"
+	return "[%s] L%d/5" % [filled, clamped]
+
 func set_escalation(level: int) -> void:
 	var name: String = Rules.LEVEL_NAMES.get(level, "Observation")
-	escalation_label.text = Strings.fmt("hud.escalation_prefix", [name])
+	escalation_label.text = "%s  %s" % [Strings.fmt("hud.escalation_prefix", [name]), escalation_meter(level)]
 	var tint := Color(0.6, 0.9, 0.6)
 	match level:
 		Rules.Level.OBSERVATION, Rules.Level.SIMPLE_DETERRENCE: