Merge upstream/main (v1.16.0) into wio-unified

Merge 254 upstream commits. Highlights relevant to the Wio fork: native
NRF52 companion power-saving (sleep when !hasPendingWork), preamble 16->32
for SF<9, generic sensor-registration model, CMD_SEND_RAW_PACKET, isEink()
display abstraction, KEEP_DISPLAY_ON_USB, contacts-sync/transient fixes.

Conflicts resolved (11 files):
- buzzer.h/.cpp: keep NRF52 include guard + our begin()->startup(); fold in
  upstream doc comment.
- platformio (wio + eink): keep our slim env layout, add upstream kiss_modem
  env (+ debug_tool=stlink on eink ble).
- GxEPDDisplay.h: take upstream isEink() override.
- EnvironmentSensorManager.h: take upstream's wider #if guard.
- DataStore.cpp: take upstream saveContacts(filter) signature, keep our
  ::openWrite (member openWrite would shadow the global 2-arg overload).
- main.cpp: keep our watchdog init + add board.onBootComplete(); adopt
  upstream's `if(!hasPendingWork()) sleep` loop.
- MyMesh.h: version -> v1.16-solo.0, build date 6 Jun 2026.
- MyMesh.cpp: keep both CMD codes (SCREENSHOT 66 + RAW_PACKET 65), both field
  inits, both handlers, our screenshot fns + upstream saveContacts/save_filter,
  upstream hasPendingWork() + our MyMeshBot include.
- UITask.cpp: keep our solo splash/clock page/snprintf/buzzer init; merge
  auto-off (+ opt-in KEEP_DISPLAY_ON_USB); merge low-batt shutdown (our EMA +
  prefs threshold + upstream's !isExternalPowered() guard and eink-aware delay).

Post-merge drift fixes (upstream API/architecture changes, not conflicts):
- applyTxPower(): radio_set_tx_power() removed upstream -> radio_driver.setTxPower().
- Sensor refactor dropped the per-sensor *_initialized flags our
  getAvailableLPPTypes() relied on; removed that override and the SENSORS page
  now derives available LPP types from the populated sensors_lpp buffer.

README kept ours via .gitattributes merge=ours. Builds verified on all 5 Wio
envs (dual, eink dual, radio_ble, dual_dev, eink_dual_dev). Not yet
hardware-verified.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

variants/wio-tracker-l1/platformio.ini

@@ -158,4 +158,9 @@ extends = WioTrackerL1CompanionDual
 build_flags = ${WioTrackerL1CompanionDual.build_flags}
   -D UI_HAS_JOYSTICK_UPDOWN=1
   -D DUAL_SERIAL=1
-  -D ENABLE_SCREENSHOT
+  -D ENABLE_SCREENSHOT
+
+[env:WioTrackerL1_kiss_modem]
+extends = WioTrackerL1
+build_src_filter = ${WioTrackerL1.build_src_filter}
+  +<../examples/kiss_modem/>

variants/wio-tracker-l1/target.cpp

@@ -37,21 +37,6 @@ bool radio_init() {
   return radio.std_init(&SPI);
 }
 
-uint32_t radio_get_rng_seed() {
-  return radio.random(0x7FFFFFFF);
-}
-
-void radio_set_params(float freq, float bw, uint8_t sf, uint8_t cr) {
-  radio.setFrequency(freq);
-  radio.setSpreadingFactor(sf);
-  radio.setBandwidth(bw);
-  radio.setCodingRate(cr);
-}
-
-void radio_set_tx_power(int8_t dbm) {
-  radio.setOutputPower(dbm);
-}
-
 mesh::LocalIdentity radio_new_identity() {
   RadioNoiseListener rng(radio);
   return mesh::LocalIdentity(&rng);  // create new random identity

variants/wio-tracker-l1/target.h

@@ -35,8 +35,5 @@ extern EnvironmentSensorManager sensors;
 #endif
 
 bool radio_init();
-uint32_t radio_get_rng_seed();
-void radio_set_params(float freq, float bw, uint8_t sf, uint8_t cr);
-void radio_set_tx_power(int8_t dbm);
 mesh::LocalIdentity radio_new_identity();