Improve VM lifecycle tooling

Make spawned VMs easier to use and restore from the host.

Add shared DNS and runtime helpers, publish <vm-name>.vm records through mapdns, and teach run/customize/interactive/restore to persist the metadata needed for SSH, DNS cleanup, and clean restores.

Seed per-VM /home and /var disks from the rootfs snapshot so package state is present on first boot, add an interactive customization entrypoint plus ssh.sh and human-friendly list output, and let stop/kill/rm operate on multiple VM identifiers.

Tear down stale TAP, dm, and loop state when VMs stop so restore can recreate them safely, and validate the updated scripts with bash -n plus targeted dry-run harnesses for teardown and restore paths.

list.sh

@@ -3,6 +3,67 @@ set -euo pipefail
 
 shopt -s nullglob
 
+format_count_unit() {
+  local count="$1"
+  local singular="$2"
+  local plural="$3"
+
+  if (( count == 1 )); then
+    printf '%s %s ago' "$count" "$singular"
+  else
+    printf '%s %s ago' "$count" "$plural"
+  fi
+}
+
+humanize_created_at() {
+  local created_at="$1"
+  local created_epoch elapsed
+
+  if [[ -z "$created_at" ]]; then
+    printf '%s' "-"
+    return 0
+  fi
+
+  created_epoch="$(date -d "$created_at" +%s 2>/dev/null || true)"
+  if [[ -z "$created_epoch" ]]; then
+    printf '%s' "$created_at"
+    return 0
+  fi
+
+  elapsed=$((NOW_EPOCH - created_epoch))
+  if (( elapsed < 0 )); then
+    elapsed=0
+  fi
+
+  if (( elapsed < 45 )); then
+    printf '%s' "a few moments ago"
+  elif (( elapsed < 90 )); then
+    printf '%s' "about a minute ago"
+  elif (( elapsed < 3600 )); then
+    format_count_unit "$((elapsed / 60))" "minute" "minutes"
+  elif (( elapsed < 5400 )); then
+    printf '%s' "about an hour ago"
+  elif (( elapsed < 86400 )); then
+    format_count_unit "$((elapsed / 3600))" "hour" "hours"
+  elif (( elapsed < 172800 )); then
+    printf '%s' "1 day ago"
+  elif (( elapsed < 604800 )); then
+    format_count_unit "$((elapsed / 86400))" "day" "days"
+  elif (( elapsed < 1209600 )); then
+    printf '%s' "1 week ago"
+  elif (( elapsed < 2592000 )); then
+    format_count_unit "$((elapsed / 604800))" "week" "weeks"
+  elif (( elapsed < 5184000 )); then
+    printf '%s' "1 month ago"
+  elif (( elapsed < 31536000 )); then
+    format_count_unit "$((elapsed / 2592000))" "month" "months"
+  elif (( elapsed < 63072000 )); then
+    printf '%s' "1 year ago"
+  else
+    format_count_unit "$((elapsed / 31536000))" "year" "years"
+  fi
+}
+
 statuses=()
 ids=()
 names=()
@@ -10,14 +71,17 @@ ips=()
 created=()
 max_name=4
 max_ip=2
+max_created=7
 GREEN='\033[32m'
 YELLOW='\033[33m'
 RESET='\033[0m'
+NOW_EPOCH="$(date +%s)"
 
 for vm_json in state/vms/*/vm.json; do
   id="$(jq -r '.meta.id // empty' "$vm_json")"
   name="$(jq -r '.meta.name // empty' "$vm_json")"
   created_at="$(jq -r '.meta.created_at // empty' "$vm_json")"
+  created_display="$(humanize_created_at "$created_at")"
   guest_ip="$(jq -r '.meta.guest_ip // empty' "$vm_json")"
   pid="$(jq -r '.meta.pid // empty' "$vm_json")"
   api_sock="$(jq -r '.meta.api_sock // empty' "$vm_json")"
@@ -34,13 +98,16 @@ for vm_json in state/vms/*/vm.json; do
   ids+=("$short_id")
   names+=("$name")
   ips+=("$guest_ip")
-  created+=("$created_at")
+  created+=("$created_display")
   if (( ${#name} > max_name )); then
     max_name=${#name}
   fi
   if (( ${#guest_ip} > max_ip )); then
     max_ip=${#guest_ip}
   fi
+  if (( ${#created_display} > max_created )); then
+    max_created=${#created_display}
+  fi
 done
 
 for i in "${!ids[@]}"; do
@@ -48,6 +115,6 @@ for i in "${!ids[@]}"; do
   if [[ "${statuses[$i]}" == "running" ]]; then
     color="$GREEN"
   fi
-  printf '%-10b %-12s %-*s %-*s %s\n' \
-    "${color}[${statuses[$i]}]${RESET}" "${ids[$i]}" "$max_name" "${names[$i]}" "$max_ip" "${ips[$i]}" "${created[$i]}"
+  printf '%-10b %-12s %-*s %-*s %-*s\n' \
+    "${color}[${statuses[$i]}]${RESET}" "${ids[$i]}" "$max_name" "${names[$i]}" "$max_ip" "${ips[$i]}" "$max_created" "${created[$i]}"
 done