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>

node-hardening/scripts/rollback/undo_ssh.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_NAME="$(basename "$0")"
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+SKILL_ROOT="$(dirname "$(dirname "$SCRIPT_DIR")")"
+
+: "${OUTPUT_DIR:=$SKILL_ROOT/outputs}"
+: "${BACKUP_DIR:=$OUTPUT_DIR/backups}"
+
+log_info()  { echo "[INFO]  $(date -Iseconds) $*"; }
+log_error() { echo "[ERROR] $(date -Iseconds) $*" >&2; }
+
+die() { log_error "$@"; exit 1; }
+
+reload_service() {
+  if systemctl list-units --type=service | grep -qE '^sshd\.service'; then
+    sudo systemctl reload sshd
+  elif systemctl list-units --type=service | grep -qE '^ssh\.service'; then
+    sudo systemctl reload ssh
+  else
+    die "Could not find ssh/sshd service under systemctl"
+  fi
+}
+
+main() {
+  mkdir -p "$OUTPUT_DIR" "$BACKUP_DIR"
+  if [[ ! -f "$BACKUP_DIR/sshd_config.before" ]]; then
+    die "No backup found at $BACKUP_DIR/sshd_config.before"
+  fi
+  log_info "Restoring /etc/ssh/sshd_config from backup"
+  sudo cp -a "$BACKUP_DIR/sshd_config.before" /etc/ssh/sshd_config
+  log_info "Reloading SSH service"
+  reload_service
+  log_info "SSH rollback complete"
+}
+
+[[ "${BASH_SOURCE[0]}" == "$0" ]] && main "$@"