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>

eth-anchor/scripts/00_preflight.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+set -euo pipefail
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+source "$SCRIPT_DIR/_common.sh"
+
+: "${ETH_RPC_URL:=}"
+: "${ETH_PRIVATE_KEY:=}"
+
+main() {
+  need date
+  need mkdir
+  need cat
+  need grep
+  need cut
+  need tr
+  need cast
+
+  [[ -n "$ETH_RPC_URL" ]] || die "ETH_RPC_URL is required."
+  [[ -n "$ETH_PRIVATE_KEY" ]] || die "ETH_PRIVATE_KEY is required (v1)."
+
+  # sanity ping
+  cast chain-id --rpc-url "$ETH_RPC_URL" >/dev/null 2>&1 || die "RPC not reachable."
+  log_info "Preflight OK."
+}
+main "$@"