SB-007-MEMORY_MANAGEMENT.md (P1, 327 lines)

• Memory management for constrained Dreamcast (16MB RAM, 8MB VRAM)
• D3-TUI budget: ~6.5MB total (terminal buffer ~4MB, fonts ~1.5MB, vertex buffers ~512KB, etc.)
• Architecture: Allocator Layer (Main/VRAM/Stack) + Debug Layer (Tracking/Leak Detection/Stats)
• API: init/shutdown, malloc/calloc/realloc/free, vram_malloc/free, debug variants with file/line info, get_stats/print_stats/validate/dump_leaks
• Debug headers in D3TUI_DEBUG builds with magic numbers and checksums
• Pool allocators for fixed-size objects (terminal cells)
• Structure packing, memory pooling, compression techniques
• Error handling: return NULL on OOM, OOM callback for custom handling, corruption detection
• Performance targets: allocation < 0.1ms, overhead < 16 bytes per allocation, fragmentation < 5%