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/ble_interface/library.json

@@ -0,0 +1,15 @@
+{
+    "name": "ble_interface",
+    "version": "0.1.0",
+    "description": "BLE-Reticulum Protocol v2.2 interface for microReticulum",
+    "keywords": "ble, reticulum, mesh",
+    "license": "MIT",
+    "frameworks": ["arduino"],
+    "platforms": ["espressif32"],
+    "dependencies": {
+        "microReticulum": "*"
+    },
+    "build": {
+        "flags": "-std=gnu++11 -I../../../../deps/microReticulum/src -I../../../../deps/microReticulum/src/BLE"
+    }
+}