Build a Round-Robin Task Scheduler

Implement a round-robin scheduler in C.

Requirements:

• Define TASK_STATE enum (READY, RUNNING, BLOCKED, ZOMBIE)
• Define Task struct with id, name, state, time_slice, counter
• Implement scheduler_init() that creates initial task queue
• Implement schedule() that picks next task round-robin style
• Implement task_yield() that voluntarily gives up CPU
• Implement task_block() that moves task to BLOCKED state
• Implement task_wake() that moves BLOCKED task to READY queue
• Simulate timer ticks decrementing time slice
• Show task queue state after each scheduling decision
• Run multiple tasks and show fair CPU distribution

Test:

• Show scheduler initialized with multiple tasks
• Show tasks running in round-robin order
• Show time slice expiration causing preemption
• Show task blocking and waking up
• Show fair counter increments across all tasks