Merge observer firmware branch into keymindCascade

Integrate compatible observer board, preset, WebConfig, display, CI, and policy updates. Preserve the checkout's newer MQTT binary preferences and WiFi bridge runtime where the forked implementations conflict. Keep ThinkNode observer networking WiFi-based until the Ethernet transport is wired into that runtime.

src/helpers/esp32/WebConfigServer.cpp

@@ -238,6 +238,12 @@ static inline bool wcIsDeferredReboot(const char* cmd) {
   return strncmp(cmd, "reboot", 6) == 0;
 }
 
+static const char* const WC_BOARD_CMDS[] = {
+  "radio.fem.rxgain", "radio.fem.txgain", "fan",
+};
+static const size_t WC_BOARD_CMD_COUNT = sizeof(WC_BOARD_CMDS) / sizeof(WC_BOARD_CMDS[0]);
+static_assert(WC_BOARD_CMD_COUNT <= 8, "board command mask must fit uint8_t");
+
 // Commands the CLI reaches but the portal cannot honestly serve. Rejected at
 // POST so nothing in the sequence runs, rather than failing halfway with a
 // reply that does not explain itself. Returns the reason, or NULL if fine.
@@ -1007,9 +1013,25 @@ void WebConfigServer::finalizeTeardown() {
   _admin_pwd_set = false;
   _session_token[0] = 0;
   _stats_json[0] = 0;
+  _board_cmds = 0;
+  _board_cmds_probed = false;
   if (_cb) _cb->onWebConfigStopped();
 }
 
+void WebConfigServer::probeBoardCommands() {
+  char command[48], reply[160];
+  uint8_t mask = 0;
+  for (size_t i = 0; i < WC_BOARD_CMD_COUNT; ++i) {
+    snprintf(command, sizeof(command), "get %s", WC_BOARD_CMDS[i]);
+    reply[0] = 0;
+    _cb->execCommand(command, reply);
+    if (reply[0] == '>') mask |= static_cast<uint8_t>(1U << i);
+  }
+  WCLock lock(_mux);
+  _board_cmds = mask;
+  _board_cmds_probed = true;
+}
+
 void WebConfigServer::tick(uint32_t now) {
   if (_stopping) {
     uint32_t refs = handlerRefCount();
@@ -1030,6 +1052,8 @@ void WebConfigServer::tick(uint32_t now) {
   }
   if (_mode == MODE_OFF) return;
 
+  if (!_board_cmds_probed) probeBoardCommands();
+
   serviceTerminal(now);
 
   // A primary ESP-NOW radio and its WiFi station cannot remain on different
@@ -1662,7 +1686,7 @@ void WebConfigServer::handleStatus(AsyncWebServerRequest* req) {
   }
   const bool has_mqtt = _mqtt_prefs != NULL;
 
-  DynamicJsonDocument doc(768);
+  DynamicJsonDocument doc(896);
   doc["mode"] = (_mode == MODE_SETUP) ? "setup" : "lan";
   doc["auth"] = authed;
   doc["needs_setup"] = (_wifi_ssid[0] == 0);
@@ -1678,6 +1702,25 @@ void WebConfigServer::handleStatus(AsyncWebServerRequest* req) {
   doc["build_date"] = _build_date;
   doc["role"] = _role;
   doc["board"] = _board_name;
+  uint8_t board_mask = 0;
+  bool board_probed = false;
+  {
+    WCLock lock(_mux);
+    board_mask = _board_cmds;
+    board_probed = _board_cmds_probed;
+  }
+  if (board_probed) {
+    char board_cmds[80] = {0};
+    size_t used = 0;
+    for (size_t i = 0; i < WC_BOARD_CMD_COUNT; ++i) {
+      if ((board_mask & (1U << i)) == 0) continue;
+      const int written = snprintf(board_cmds + used, sizeof(board_cmds) - used,
+                                   "%s%s", used ? "," : "", WC_BOARD_CMDS[i]);
+      if (written < 0 || static_cast<size_t>(written) >= sizeof(board_cmds) - used) break;
+      used += static_cast<size_t>(written);
+    }
+    doc["board_cmds"] = board_cmds;
+  }
   doc["uptime_s"] = millis() / 1000;
 #ifdef WITH_MQTT_BRIDGE
   doc["runtime_slots"] = has_mqtt ? RUNTIME_MQTT_SLOTS : 0;