feat(register): add brev-managed sshd on port 2222#305
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Add a hardened sshd instance managed by brev register/deregister that runs on port 2222 alongside the system sshd. Uses public key auth only, modern ciphers/KEX/MACs, isolated host keys in /etc/brev-sshd/, and a systemd unit for process supervision. - Add ManagedSSHDaemon interface + BrevSSHD provider - Wire sshd install as Step 2 in registration flow - Add non-fatal sshd cleanup to deregistration flow - Add config/unit content tests and mock-based integration tests
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Summary
/etc/brev-sshd/, systemd unit for process supervisionTest plan
go build ./...compiles cleanlygo test ./pkg/cmd/register/... ./pkg/cmd/deregister/...all passbrev registercreates/etc/brev-sshd/sshd_config, startsbrev-sshd.service,ss -tlnp | grep 2222shows listeningssh -p 2222 user@localhostworks with key auth, password auth rejectedbrev deregisterstops service and removes all brev-sshd artifacts