refactor(track-core): remove app-facing track adapters

Keep track-core focused on portable track state, scheme runtime, PID runtime, memory strip, and render planning.

Remove the ESP-IDF/nanopb Track adapter headers and sources from the submodule so app/protobuf ownership can live in a separate firmware component.

The standalone CMake and Python binding surface remains unchanged, including the emulator-facing APIs.

CMakeLists.txt

@@ -9,21 +9,11 @@ set(TRACK_CORE_SOURCES
 )
 
 if(DEFINED IDF_TARGET)
-    set(TRACK_CORE_IDF_SOURCES
-        src/esp/app_track_decoder.cpp
-        src/esp/app_track_drawer.cpp
-        src/esp/app_track_model.cpp
-    )
-
     idf_component_register(
-        SRCS ${TRACK_CORE_SOURCES} ${TRACK_CORE_IDF_SOURCES}
+        SRCS ${TRACK_CORE_SOURCES}
         INCLUDE_DIRS include
-        REQUIRES
-            app_proto
-            app_strip_if
-            app_utils
-            app_utils_clock
     )
+    target_compile_features(${COMPONENT_LIB} PUBLIC cxx_std_23)
 else()
     cmake_minimum_required(VERSION 3.20)
     project(track_core VERSION 0.1.0 LANGUAGES CXX)