P0/P1/P2: force-monitor boot, VMPIDR, GetVCpuRegs, CI, stack capture
7 commits from filtered-master: force-monitor boot via minimal-init, VMPIDR-based vm_id detection, auto-stack capture from SP, GetVCpuRegs implemented, CI/CD workflow, HostLog error handling, compiler warnings fixed, docs/design-proposal.md (734 lines).