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.

Tests/TactilityKernel/DriverTest.cpp

@@ -1,13 +1,31 @@
 #include "doctest.h"
+
 #include <tactility/driver.h>
+#include <tactility/module.h>
+
+static Module module = {
+    .name = "test_module",
+    .start = nullptr,
+    .stop = nullptr
+};
 
 TEST_CASE("driver_construct and driver_destruct should set and unset the correct fields") {
     Driver driver = { 0 };
+    driver.owner = &module;
 
     CHECK_EQ(driver_construct(&driver), ERROR_NONE);
-    CHECK_NE(driver.internal.data, nullptr);
+    CHECK_NE(driver.driver_private, nullptr);
+    CHECK_EQ(driver_destruct(&driver), ERROR_NONE);
+    CHECK_EQ(driver.driver_private, nullptr);
+}
+
+TEST_CASE("a driver without a module should not be destructible") {
+    Driver driver = { 0 };
+
+    CHECK_EQ(driver_construct(&driver), ERROR_NONE);
+    CHECK_EQ(driver_destruct(&driver), ERROR_NOT_ALLOWED);
+    driver.owner = &module;
     CHECK_EQ(driver_destruct(&driver), ERROR_NONE);
-    CHECK_EQ(driver.internal.data, nullptr);
 }
 
 TEST_CASE("driver_is_compatible should return true if a compatible value is found") {
@@ -19,7 +37,8 @@ TEST_CASE("driver_is_compatible should return true if a compatible value is foun
         .stopDevice = nullptr,
         .api = nullptr,
         .deviceType = nullptr,
-        .internal = { 0 }
+        .owner = &module,
+        .driver_private = nullptr
     };
     CHECK_EQ(driver_is_compatible(&driver, "test_compatible"), true);
     CHECK_EQ(driver_is_compatible(&driver, "nope"), false);
@@ -35,7 +54,8 @@ TEST_CASE("driver_find should only find a compatible driver when the driver was
         .stopDevice = nullptr,
         .api = nullptr,
         .deviceType = nullptr,
-        .internal = { 0 }
+        .owner = &module,
+        .driver_private = nullptr
     };
 
     Driver* found_driver = driver_find_compatible("test_compatible");