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/scheduler.h

@@ -0,0 +1,47 @@
+/**
+ * @file scheduler.h
+ * @brief Priority-based preemptive scheduler
+ */
+
+#ifndef SCHEDULER_H
+#define SCHEDULER_H
+
+#include "kernel.h"
+#include "task.h"
+
+/* Scheduler Types */
+typedef enum {
+    SCHEDULER_PRIORITY_PREEMPTIVE = 0,
+    SCHEDULER_ROUND_ROBIN = 1,
+    SCHEDULER_EDF = 2,  /* Earliest Deadline First */
+    SCHEDULER_RATE_MONOTONIC = 3
+} SchedulerType_t;
+
+/* Scheduler Configuration */
+typedef struct {
+    SchedulerType_t type;
+    TickType_t time_slice_ticks;  /* For round-robin */
+    bool enable_deadline_monitoring;
+} SchedulerConfig_t;
+
+/* Scheduler Interface */
+void scheduler_init(const SchedulerConfig_t* config);
+void scheduler_start(void);
+void scheduler_tick(void);
+void scheduler_add_task(TaskHandle_t task);
+void scheduler_remove_task(TaskHandle_t task);
+void scheduler_update_task_state(TaskHandle_t task, TaskState_t new_state);
+TaskHandle_t scheduler_select_next_task(void);
+void scheduler_context_switch(TaskHandle_t next_task);
+
+/* Scheduler Statistics */
+typedef struct {
+    uint32_t context_switches;
+    uint32_t preemptions;
+    TickType_t max_scheduling_latency;
+    TickType_t total_idle_time;
+} SchedulerStatistics_t;
+
+void scheduler_get_statistics(SchedulerStatistics_t* stats);
+
+#endif /* SCHEDULER_H */