T-Watch S3: fixed tilt raise bug.

Applied the same memw barrier + identical comment to twatchs3plusboard.cpp, hardening the Plus against the same latent race it was previously surviving only by luck

variants/lilygo_twatch_s3/TWatchS3Board.cpp

@@ -5,7 +5,10 @@
 
 volatile bool TWatchS3Board::_tilt_flag = false;
 
-void IRAM_ATTR TWatchS3Board::onTiltISR() { _tilt_flag = true; }
+// memw forces the _tilt_flag store to retire to SRAM before this ISR
+// returns. Without it, tiltFired() in the main loop can read a stale
+// value and raise-to-wake is missed. Do not remove.
+void IRAM_ATTR TWatchS3Board::onTiltISR() { _tilt_flag = true; asm volatile("memw" ::: "memory"); }
 
 // ---- Wrapper-free BMA423 step counter (raw I2C) ----------------------------
 // SensorLib's SensorBMA423 step-counter methods do not compile in this build,

variants/lilygo_twatch_s3/TWatchS3Board.h

@@ -80,4 +80,4 @@ public:
   const char* getManufacturerName() const override {
     return "LilyGo T-Watch S3";
   }
-};
+};

variants/lilygo_twatch_s3_plus/TWatchS3PlusBoard.cpp

@@ -5,7 +5,10 @@
 
 volatile bool TWatchS3PlusBoard::_tilt_flag = false;
 
-void IRAM_ATTR TWatchS3PlusBoard::onTiltISR() { _tilt_flag = true; }
+// memw forces the _tilt_flag store to retire to SRAM before this ISR
+// returns. Without it, tiltFired() in the main loop can read a stale
+// value and raise-to-wake is missed. Do not remove.
+void IRAM_ATTR TWatchS3PlusBoard::onTiltISR() { _tilt_flag = true; asm volatile("memw" ::: "memory"); }
 
 // ---- Wrapper-free BMA423 step counter (raw I2C) ----------------------------
 // SensorLib's SensorBMA423 step-counter methods do not compile in this build,