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92d935d62f
- Implement IDT with handlers for CPU exceptions (vectors 0-19) - Add kernel-space GDT module to support identity mapping removal - Add memory intrinsics (memcpy, memset, memmove, memcmp) for no_std - Add remove_identity_mapping() to paging module - Reload GDT to higher-half before removing identity mapping Exception handlers print full register state and halt on fault. Tested with divide-by-zero and INT3 breakpoint exceptions.