AccessibilityCollector
Passive collector for SignalCategory.Accessibility.
Reports font scale, accessibility-enabled/touch-exploration flags, enabled-service count, display inversion and color-correction (daltonizer) via AccessibilityManager and Settings.Secure.
Privacy: accessibility usage can reveal assistive-technology needs (health-adjacent) and is behaviorally identifying; the enabled-service list is counted, not exposed. No runtime permission required.