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/test/tests/test_accessibility.gd

@@ -0,0 +1,64 @@
+extends RefCounted
+## Accessibility: escalation cues that survive grayscale (shape + level, not hue
+## alone) and the HUD font scale from settings.
+
+const Hud := preload("res://src/game/ui/hud.gd")
+const Rules := preload("res://src/core/rules.gd")
+
+func test_meter_shape_and_level() -> bool:
+	var a := TestUtils.check_eq(Hud.escalation_meter(0), "[-----] L0/5", "calm shows an empty meter")
+	var b := TestUtils.check_eq(Hud.escalation_meter(3), "[###--] L3/5", "three filled blocks at blocking")
+	var c := TestUtils.check_eq(Hud.escalation_meter(5), "[#####] L5/5", "emergency fills the meter")
+	var d := TestUtils.check_eq(Hud.escalation_meter(99), "[#####] L5/5", "levels clamp at 5")
+	var e := TestUtils.check_eq(Hud.escalation_meter(-2), "[-----] L0/5", "levels clamp at 0")
+	return a and b and c and d and e
+
+func test_meter_is_not_hue_only() -> bool:
+	## Every level must differ in shape/text, independent of colour.
+	var seen: Array[String] = []
+	for level in 6:
+		var meter: String = Hud.escalation_meter(level)
+		if seen.has(meter):
+			return TestUtils.fail("levels %d and %d share a meter" % [level, seen.find(meter)])
+		seen.append(meter)
+	return TestUtils.check(seen.size() == 6, "all six levels have distinct meters")
+
+func test_escalation_label_includes_meter_and_name() -> bool:
+	var hud: Node = Hud.new()
+	hud.set_escalation(Rules.Level.FORMAL_WARNING)
+	var text: String = hud.escalation_label.text
+	var a := TestUtils.check(text.contains("Formal Warning"), "label names the level")
+	var b := TestUtils.check(text.contains("[##---]"), "label shows the shape meter")
+	var c := TestUtils.check(text.contains("L2/5"), "label shows the numeric level")
+	hud.free()
+	return a and b and c
+
+func test_font_scale_applies_to_core_labels() -> bool:
+	var hud: Node = Hud.new()
+	var base_top: int = hud.top_label.get_theme_font_size("font_size")
+	var base_log: int = hud.log_label.get_theme_font_size("font_size")
+	var base_esc: int = hud.escalation_label.get_theme_font_size("font_size")
+	var base_mode: int = hud.mode_label.get_theme_font_size("font_size")
+	hud.set_font_scale(1.4)
+	var a := TestUtils.check(hud.top_label.get_theme_font_size("font_size") > base_top, "top label grows")
+	var b := TestUtils.check(hud.log_label.get_theme_font_size("font_size") > base_log, "log grows")
+	var c := TestUtils.check(hud.escalation_label.get_theme_font_size("font_size") > base_esc, "escalation label grows")
+	var d := TestUtils.check(hud.mode_label.get_theme_font_size("font_size") > base_mode, "mode label grows")
+	# Scaling is by font size, not Control.scale, so anchored labels keep layout.
+	var e := TestUtils.check(is_equal_approx(hud.top_label.scale.x, 1.0), "labels are not Control-scaled")
+	hud.set_font_scale(9.0)
+	var capped: int = hud.top_label.get_theme_font_size("font_size")
+	var f := TestUtils.check(capped <= int(round(float(base_top) * 1.75)) + 1, "scale clamps at 1.75")
+	hud.free()
+	return a and b and c and d and e and f
+
+func test_settings_font_scale_is_applied_after_ui_exists() -> bool:
+	## The HUD is created after settings load, so the manager must re-apply.
+	var src := FileAccess.get_file_as_string("res://src/game/game_manager.gd")
+	var a := TestUtils.check(src.contains("_apply_settings(player_settings)"), "settings are applied on boot")
+	var build_idx := src.find("_build_ui()")
+	var apply_idx := src.find("_apply_settings(player_settings)", build_idx)
+	var b := TestUtils.check(apply_idx > build_idx, "the second apply happens after the HUD is built")
+	var c := TestUtils.check(src.contains("hud.set_font_scale(float(settings.get("),
+		"settings drive the HUD font scale")
+	return a and b and c