Initial commit: VaultMesh Skills collection

Collection of operational skills for VaultMesh infrastructure including:
- backup-sovereign: Backup and recovery operations
- btc-anchor: Bitcoin anchoring
- cloudflare-tunnel-manager: Cloudflare tunnel management
- container-registry: Container registry operations
- disaster-recovery: Disaster recovery procedures
- dns-sovereign: DNS management
- eth-anchor: Ethereum anchoring
- gitea-bootstrap: Gitea setup and configuration
- hetzner-bootstrap: Hetzner server provisioning
- merkle-forest: Merkle tree operations
- node-hardening: Node security hardening
- operator-bootstrap: Operator initialization
- proof-verifier: Cryptographic proof verification
- rfc3161-anchor: RFC3161 timestamping
- secrets-vault: Secrets management

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

hetzner-bootstrap/scripts/_common.sh

@@ -0,0 +1,79 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+log_info(){ echo "[INFO]  $(date -Iseconds) $*"; }
+log_warn(){ echo "[WARN]  $(date -Iseconds) $*" >&2; }
+log_error(){ echo "[ERROR] $(date -Iseconds) $*" >&2; }
+die(){ log_error "$*"; exit 1; }
+need(){ command -v "$1" >/dev/null 2>&1 || die "Missing required tool: $1"; }
+
+confirm_gate() {
+  : "${DRY_RUN:=1}"
+  : "${REQUIRE_CONFIRM:=1}"
+  : "${CONFIRM_PHRASE:=I UNDERSTAND THIS CAN AFFECT REMOTE ACCESS}"
+
+  [[ "$DRY_RUN" == "0" ]] || die "DRY_RUN=$DRY_RUN (set DRY_RUN=0)."
+  if [[ "$REQUIRE_CONFIRM" == "1" ]]; then
+    echo "Type to confirm:"
+    echo "  $CONFIRM_PHRASE"
+    echo
+    read -r -p "> " typed
+    [[ "$typed" == "$CONFIRM_PHRASE" ]] || die "Confirmation phrase did not match."
+  fi
+}
+
+require_root() {
+  [[ "$(id -u)" == "0" ]] || die "Run as root."
+}
+
+backup_file() {
+  local src="$1" backup_dir="$2"
+  mkdir -p "$backup_dir"
+  if [[ -f "$src" ]]; then
+    local ts; ts="$(date -Iseconds | tr ':' '-')"
+    cp -p "$src" "$backup_dir/$(basename "$src").${ts}.bak"
+  fi
+}
+
+os_codename() {
+  # Prefer /etc/os-release (present on Debian/Ubuntu).
+  local code=""
+  if [[ -r /etc/os-release ]]; then
+    # shellcheck disable=SC1091
+    . /etc/os-release
+    code="${VERSION_CODENAME:-}"
+  fi
+  if [[ -z "$code" ]] && command -v lsb_release >/dev/null 2>&1; then
+    code="$(lsb_release -cs 2>/dev/null || true)"
+  fi
+  echo "$code"
+}
+
+ssh_service_name() {
+  # Debian/Ubuntu commonly use "ssh.service". Some distros use "sshd.service".
+  if systemctl status ssh >/dev/null 2>&1; then
+    echo "ssh"
+    return 0
+  fi
+  if systemctl status sshd >/dev/null 2>&1; then
+    echo "sshd"
+    return 0
+  fi
+  # Fallback
+  echo "ssh"
+}
+
+reload_ssh_service() {
+  local svc; svc="$(ssh_service_name)"
+  systemctl reload "$svc" >/dev/null 2>&1 || systemctl restart "$svc" >/dev/null 2>&1 || true
+}
+
+restart_ssh_service() {
+  local svc; svc="$(ssh_service_name)"
+  systemctl restart "$svc" >/dev/null 2>&1 || true
+}
+
+is_ssh_active() {
+  local svc; svc="$(ssh_service_name)"
+  systemctl is-active "$svc" >/dev/null 2>&1
+}