smolBSD

feat(ur-bsd): shrink VM image — fix VMSIZE override, limit kernel modules, widen trim (#29)

fix(ci): test -c /dev/tpm0 — clean present/absent output

fix(ci): check /dev/tpm0 presence — no pkg install (SLIRP has no outbound inet)

fix(ci): UserKnownHostsFile=/dev/null — stale host key in known_hosts

fix(fix-freebsd-vm): clear buffer in run_cmd — root cause of all command failures