Kernel improvements (#468)

* **New Features**
  * Plugin-style modules for platforms and devices with start/stop lifecycle and a runtime-consumable device tree array.

* **Refactor**
  * Consolidated initialization into a kernel/module startup flow.
  * Generated devicetree artifacts moved to the build Generated directory.

* **Changes**
  * Removed legacy no-op registration hooks and I2C lock/unlock wrappers.
  * Driver ownership and private state moved to explicit module/owner model.
  * Added ERROR_NOT_ALLOWED error code.

Platforms/PlatformEsp32/Source/module.cpp

@@ -0,0 +1,33 @@
+#include <tactility/check.h>
+#include <tactility/driver.h>
+#include <tactility/module.h>
+
+extern "C" {
+
+extern Driver esp32_gpio_driver;
+extern Driver esp32_i2c_driver;
+
+static error_t start() {
+    /* We crash when construct fails, because if a single driver fails to construct,
+     * there is no guarantee that the previously constructed drivers can be destroyed */
+    check(driver_construct(&esp32_gpio_driver) == ERROR_NONE);
+    check(driver_construct(&esp32_i2c_driver) == ERROR_NONE);
+    return ERROR_NONE;
+}
+
+static error_t stop() {
+    /* We crash when destruct fails, because if a single driver fails to destruct,
+     * there is no guarantee that the previously destroyed drivers can be recovered */
+    check(driver_destruct(&esp32_gpio_driver) == ERROR_NONE);
+    check(driver_destruct(&esp32_i2c_driver) == ERROR_NONE);
+    return ERROR_NONE;
+}
+
+// The name must be exactly "platform_module"
+struct Module platform_module = {
+    .name = "ESP32 Platform",
+    .start = start,
+    .stop = stop
+};
+
+}