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v2.5.0 — DMA, Pledge, Unveil, ASLR
Inter-shard GPU DMA with capability-gated access. `pledge_gpu` / `unveil_vram` for monotonic syscall restriction and VRAM range locking. Per-shard GPU ASLR (randomized VRAM/MMIO virtual addresses).
Phase 2: Multi-Shard GPU Isolation (2.3-2.5)