Patch release for the v0.4.0 DMA IOMMU and full-fabric implementation upgrade.\n\n- Pins a checksum-verified OSS CAD Suite for full-fabric synthesis in GitHub Actions\n- Keeps distro Verilator and suite Verilator gate smoke warning-clean\n- Public CI passes documentation, quick regression, solver properties, implementation, and real UVM closure\n- Architecture and measured verification results are unchanged from v0.4.0