Send ESP-NOW accel only on deadzone change and harden BLE+WiFi OTA coex.

Quiet pods no longer spam 100 Hz samples; mute wifi logs and throttle BLE
notifies during slave distribution so the wifi task stack does not panic.

Co-authored-by: Cursor <cursoragent@cursor.com>

main/bosch456.h

@@ -19,7 +19,7 @@
 /** Sensor interrupt line → ESP32 GPIO (active high, rising edge). */
 #define BMA456_INT_GPIO 10
 
-/** Software filter: log accel only when |axis - last| > deadzone (raw LSB). */
+/** Software filter: emit accel only when |axis - last| > deadzone (raw LSB). */
 #define BMA456_DEFAULT_ACCEL_DEADZONE 100u
 
 /**
@@ -81,6 +81,16 @@ bool bma456_is_ready(void);
 void bma456_set_accel_deadzone(uint32_t deadzone_lsb);
 uint32_t bma456_get_accel_deadzone(void);
 
+/**
+ * ESP-NOW stream filter: true if sample exceeds deadzone vs last streamed
+ * sample (or no baseline yet). On true, commits (x,y,z) as stream baseline.
+ * Independent of the log filter baseline.
+ */
+bool bma456_accel_stream_take_if_changed(int16_t x, int16_t y, int16_t z);
+
+/** Force next stream take to accept (call when accel stream is enabled). */
+void bma456_accel_stream_reset_baseline(void);
+
 /** Log accel when any axis moved more than deadzone since last reported sample. */
 void bma456_report_accel_if_changed(int16_t x, int16_t y, int16_t z);