Initial commit: standalone Pyxis T-Deck firmware

Split T-Deck firmware from microReticulum examples/lxmf_tdeck/ into its
own repo. microReticulum is consumed as a git submodule dependency pinned
to feat/t-deck. All include paths updated from relative symlinks to bare
includes resolved via library build flags.

Both tdeck (NimBLE) and tdeck-bluedroid environments compile successfully.
Licensed under AGPLv3.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/auto_interface/auto_config.h.example

@@ -0,0 +1,19 @@
+#pragma once
+
+// AutoInterface configuration - DO NOT COMMIT auto_config.h
+// Copy auto_config.h.example to auto_config.h and fill in your values
+
+// WiFi credentials (for ESP32)
+#define AUTO_WIFI_SSID "your_wifi_ssid"
+#define AUTO_WIFI_PASSWORD "your_wifi_password"
+
+// Network interface to use (optional - leave empty for auto-detect)
+// Examples: "eth0", "wlan0", "enp0s3"
+#define AUTO_INTERFACE_NAME ""
+
+// Group ID (default: "reticulum" - must match Python RNS config)
+#define AUTO_GROUP_ID "reticulum"
+
+// Ports (default values match Python RNS)
+#define AUTO_DISCOVERY_PORT 29716
+#define AUTO_DATA_PORT 42671