Updated readme

README.md

@@ -80,6 +80,10 @@ Config Layer (holding CONFIG button)
   - Throttle hold (capture + remap around center)
   - Virtual throttle mode (map right‑X to Slider; disable Z)
 - Status LED (WS2812 via PIO) for mode/health indication
+  - Power-on heartbeat (green) before USB enumeration
+  - Activity colors: green (active), blue (virtual throttle/calibration), orange (holds)
+  - Warning/error tones (red) and bootloader purple
+  - Idle heartbeat flashes at half speed once inputs settle
 
 ## Hardware
 
@@ -150,6 +154,18 @@ Notes
 - During calibration, min/max are tracked from the smoothed ADC values.
 - On mode change (M10/M7) centers are reset from the current position.
 
+## Status LED behaviour
+
+| Condition                         | Colour  | Pattern                  |
+|-----------------------------------|---------|--------------------------|
+| Power (USB not enumerated yet)    | Green   | Fast heartbeat           |
+| Normal active operation           | Green   | Solid                    |
+| Idle (no input activity)          | Green   | Slow heartbeat (½ speed) |
+| Virtual throttle / calibration    | Blue    | Solid / heartbeat        |
+| Throttle hold / other overlays    | Orange  | Solid / heartbeat        |
+| Warning / Error                   | Red     | Blink / heartbeat        |
+| Bootloader                        | Purple  | Solid                    |
+
 ## Runtime controls
 
 - Throttle hold: press the Top‑left‑mode button to capture the current throttle value