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Mark completed items: - Process creation with isolated address spaces - Physical memory allocator and frame management - Page table manipulation via recursive mapping - Resource attachment (4KB page mapping) - User mode execution (ring 3) - SYSCALL/SYSRET interface with write/exit - Boot infrastructure (PIC, GDT/TSS, IDT, IST) Stage 1 is approximately 80% complete. Remaining work: - Resource management syscalls (mmap/munmap) - Permission update API - ELF loader - Per-process resource tracking