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/templates/auditd_rules.tpl

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+# Managed by node-hardening skill
+
+# Increase backlog for busy systems
+-b 8192
+
+# Identity files
+-w /etc/passwd -p wa -k identity
+-w /etc/group -p wa -k identity
+-w /etc/shadow -p wa -k identity
+
+# SSH config
+-w /etc/ssh/sshd_config -p wa -k sshd
+
+# Privilege escalation
+-w /etc/sudoers -p wa -k sudo
+-w /etc/sudoers.d/ -p wa -k sudo
+
+# Systemd unit changes
+-w /etc/systemd/system/ -p wa -k systemd
+
+# Network config
+-w /etc/ufw/ -p wa -k ufw
+
+# End of rules
+-e 1

node-hardening/templates/fail2ban_jail.tpl

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+# Managed by node-hardening skill
+[DEFAULT]
+# Ban after 5 failures within 10 minutes
+findtime = 10m
+maxretry = 5
+bantime = 1h
+backend = systemd
+
+[sshd]
+enabled = true
+port = {{SSH_PORT}}
+logpath = %(sshd_log)s

node-hardening/templates/sshd_config.tpl

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+# Managed by node-hardening skill
+# Backup of previous config stored in outputs/backups
+
+Port {{SSH_PORT}}
+Protocol 2
+
+PermitRootLogin no
+PasswordAuthentication no
+KbdInteractiveAuthentication no
+ChallengeResponseAuthentication no
+PubkeyAuthentication yes
+PermitEmptyPasswords no
+
+# Keep PAM enabled for session setups (Ubuntu default)
+UsePAM yes
+
+X11Forwarding no
+AllowAgentForwarding yes
+AllowTcpForwarding yes
+
+ClientAliveInterval 300
+ClientAliveCountMax 2
+
+LogLevel VERBOSE
+
+# Optional: restrict users
+# AllowUsers {{ALLOW_USERS}}