Add full automotive RTOS project

Add kernel (Cortex-M0/M3/M4, Tricore, S32K, RISC-V ports), drivers,
middleware (CAN stack, diagnostics, safety), applications, board
support, build/test tooling, and documentation.

tests/unit/test_task.c

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+/**
+ * @file test_task.c
+ * @brief Unit tests for task management
+ */
+
+#include "unity.h"
+#include "kernel.h"
+#include "task.h"
+#include <string.h>
+
+/* Test variables */
+static TaskHandle_t test_task_handle;
+static volatile bool task_executed = false;
+static volatile uint32_t task_execution_count = 0;
+
+/* Test task function */
+static void simple_task(void* params) {
+    (void)params;
+    task_executed = true;
+    task_execution_count++;
+
+    /* Task should terminate after execution */
+    while (1) {
+        kernel_delay(1000);
+    }
+}
+
+/* Setup */
+void setUp(void) {
+    task_executed = false;
+    task_execution_count = 0;
+    kernel_init();
+}
+
+/* Teardown */
+void tearDown(void) {
+    kernel_stop();
+}
+
+/* ============================================================================
+ * Test Cases
+ * ============================================================================ */
+
+/**
+ * @brief Test task creation
+ */
+void test_task_create(void) {
+    TaskConfig_t config = {
+        .name = "test_task",
+        .function = simple_task,
+        .parameters = NULL,
+        .stack_size = 1024,
+        .priority = 1,
+        .period_ticks = 0
+    };
+
+    test_task_handle = task_create(&config);
+
+    TEST_ASSERT_NOT_NULL(test_task_handle);
+    TEST_ASSERT_EQUAL_STRING("test_task", test_task_handle->name);
+    TEST_ASSERT_EQUAL(1, task_get_priority(test_task_handle));
+}
+
+/**
+ * @brief Test task creation with invalid parameters
+ */
+void test_task_create_invalid(void) {
+    TaskConfig_t config = {
+        .name = NULL,
+        .function = NULL,
+        .parameters = NULL,
+        .stack_size = 0,
+        .priority = 100,
+        .period_ticks = 0
+    };
+
+    test_task_handle = task_create(&config);
+    TEST_ASSERT_NULL(test_task_handle);
+}
+
+/**
+ * @brief Test task suspend and resume
+ */
+void test_task_suspend_resume(void) {
+    TaskConfig_t config = {
+        .name = "suspend_test",
+        .function = simple_task,
+        .parameters = NULL,
+        .stack_size = 1024,
+        .priority = 2,
+        .period_ticks = 0
+    };
+
+    test_task_handle = task_create(&config);
+
+    /* Suspend task */
+    TEST_ASSERT_EQUAL(KERNEL_OK, task_suspend(test_task_handle));
+    TEST_ASSERT_EQUAL(TASK_SUSPENDED, task_get_state(test_task_handle));
+
+    /* Resume task */
+    TEST_ASSERT_EQUAL(KERNEL_OK, task_resume(test_task_handle));
+    TEST_ASSERT_EQUAL(TASK_READY, task_get_state(test_task_handle));
+}
+
+/**
+ * @brief Test task priority change
+ */
+void test_task_set_priority(void) {
+    TaskConfig_t config = {
+        .name = "priority_test",
+        .function = simple_task,
+        .parameters = NULL,
+        .stack_size = 1024,
+        .priority = 3,
+        .period_ticks = 0
+    };
+
+    test_task_handle = task_create(&config);
+
+    /* Change priority */
+    TEST_ASSERT_EQUAL(KERNEL_OK, task_set_priority(test_task_handle, 1));
+    TEST_ASSERT_EQUAL(1, task_get_priority(test_task_handle));
+
+    /* Invalid priority */
+    TEST_ASSERT_EQUAL(KERNEL_INVALID_PARAMETER,
+                      task_set_priority(test_task_handle, 100));
+}
+
+/**
+ * @brief Test task statistics
+ */
+void test_task_statistics(void) {
+    TaskConfig_t config = {
+        .name = "stats_test",
+        .function = simple_task,
+        .parameters = NULL,
+        .stack_size = 1024,
+        .priority = 4,
+        .period_ticks = 10
+    };
+
+    test_task_handle = task_create(&config);
+
+    kernel_start();
+    kernel_delay(100);
+
+    TaskStatistics_t stats;
+    TEST_ASSERT_EQUAL(KERNEL_OK, task_get_statistics(test_task_handle, &stats));
+    TEST_ASSERT_GREATER_THAN(0, stats.execution_count);
+}
+
+/**
+ * @brief Test task deletion
+ */
+void test_task_delete(void) {
+    TaskConfig_t config = {
+        .name = "delete_test",
+        .function = simple_task,
+        .parameters = NULL,
+        .stack_size = 1024,
+        .priority = 5,
+        .period_ticks = 0
+    };
+
+    test_task_handle = task_create(&config);
+
+    TEST_ASSERT_EQUAL(KERNEL_OK, task_delete(test_task_handle));
+}
+
+/* ============================================================================
+ * Test Runner
+ * ============================================================================ */
+int main(void) {
+    UNITY_BEGIN();
+
+    RUN_TEST(test_task_create);
+    RUN_TEST(test_task_create_invalid);
+    RUN_TEST(test_task_suspend_resume);
+    RUN_TEST(test_task_set_priority);
+    RUN_TEST(test_task_statistics);
+    RUN_TEST(test_task_delete);
+
+    return UNITY_END();
+}