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.

kernel/include/timer.h

@@ -0,0 +1,43 @@
+/**
+ * @file timer.h
+ * @brief Software timer management
+ */
+
+#ifndef TIMER_H
+#define TIMER_H
+
+#include "kernel.h"
+
+/* Timer Types */
+typedef enum {
+    TIMER_ONE_SHOT = 0,
+    TIMER_PERIODIC = 1
+} TimerType_t;
+
+/* Timer Callback */
+typedef void (*TimerCallback_t)(void* parameters);
+
+/* Timer Control Block */
+typedef struct {
+    char name[16];
+    TimerType_t type;
+    TickType_t period_ticks;
+    TickType_t expiry_time;
+    TimerCallback_t callback;
+    void* parameters;
+    bool is_active;
+    struct Timer* next;
+} Timer_t;
+
+/* Timer Functions */
+KernelStatus_t timer_create(Timer_t* timer, const char* name, TimerType_t type,
+                           TickType_t period, TimerCallback_t callback,
+                           void* parameters);
+KernelStatus_t timer_start(Timer_t* timer);
+KernelStatus_t timer_stop(Timer_t* timer);
+KernelStatus_t timer_reset(Timer_t* timer);
+KernelStatus_t timer_delete(Timer_t* timer);
+bool timer_is_active(Timer_t* timer);
+void timer_process_expired(void);
+
+#endif /* TIMER_H */