Validate SSH/network path against current gates

[Pummelchen]

Summary

Validate the SSH/network path against current QEMU gates and document any gaps.

Problem / objective

Network, remote-login, SSH bridge, and userspace SSH/SFTP code cross several sensitive boundaries and should have clear validation evidence.

Acceptance criteria

• Run or document blockers for network and SSH smoke gates.
• Confirm current host forwarding and local bridge behavior.
• File focused follow-up issues for any reproducible failures.

Validation

• make qemu-network-suite
• make qemu-ssh-smoke
• make xaios-ssh-bridge if interactive validation is needed

Relevant files

• kernel/net/
• kernel/runtime/network_stack.c
• kernel/runtime/remote_login.c
• userspace/sshd/
• scripts/run-qemu-aarch64.sh
• scripts/qemu-network-suite.py
• scripts/qemu-ssh-smoke.py