Implement fork() Semantics in Userspace Process Simulator

Implement a userspace process simulator that mimics fork() behavior.

Requirements:

• Define Process structure with pid, ppid, state, program counter
• Implement process_create() to allocate new process
• Implement fork() that creates child process (copy parent state)
• Implement scheduler to run processes in round-robin
• Implement wait() for parent to wait for child termination
• Implement exit() to terminate process
• Print process creation, switching, and termination events
• Maintain process queue and schedule properly
• Simulate at least 3 generations of processes (parent → child → grandchild)