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>

backup-sovereign/checks/check_space.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+# Check: Sufficient disk space available
+# Returns 0 if >100MB available, 1 otherwise
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+SKILL_ROOT="$(dirname "$SCRIPT_DIR")"
+
+: "${OUTPUT_DIR:=$SKILL_ROOT/outputs}"
+
+# Ensure output dir exists for df check
+mkdir -p "$OUTPUT_DIR"
+
+# Get available space in KB
+avail=$(df -P "$OUTPUT_DIR" | awk 'NR==2 {print $4}')
+
+# Require at least 100MB (102400 KB)
+[[ "$avail" -ge 102400 ]]