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>

proof-verifier/scripts/_common.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+set -euo pipefail
+log_info(){ echo "[INFO]  $(date -Iseconds) $*"; }
+log_warn(){ echo "[WARN]  $(date -Iseconds) $*" >&2; }
+log_error(){ echo "[ERROR] $(date -Iseconds) $*" >&2; }
+need(){ command -v "$1" >/dev/null 2>&1 || { log_error "Missing tool: $1"; return 1; }; }
+
+json_escape() {
+  local s="$1"
+  s="${s//\\/\\\\}"; s="${s//\"/\\\"}"; s="${s//$'\n'/\\n}"
+  printf "%s" "$s"
+}
+
+net_flag() {
+  : "${BTC_NETWORK:=testnet}"
+  case "$BTC_NETWORK" in
+    mainnet) echo "" ;;
+    testnet) echo "-testnet" ;;
+    signet) echo "-signet" ;;
+    *) echo "-testnet" ;;
+  esac
+}