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/checks/check_ssh.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if [[ ! -f /etc/ssh/sshd_config ]]; then
+  echo "sshd_config: missing"
+  exit 1
+fi
+
+if grep -Eq '^PasswordAuthentication\s+no' /etc/ssh/sshd_config; then
+  echo "ssh: password auth disabled"
+else
+  echo "ssh: password auth not disabled"
+  exit 1
+fi
+
+if grep -Eq '^PermitRootLogin\s+no' /etc/ssh/sshd_config; then
+  echo "ssh: root login disabled"
+else
+  echo "ssh: root login not disabled"
+  exit 1
+fi
+
+exit 0