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>

btc-anchor/scripts/_common.sh

@@ -0,0 +1,55 @@
+#!/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) $*" >&2; }
+die(){ log_error "$*"; exit 1; }
+need(){ command -v "$1" >/dev/null 2>&1 || die "Missing required tool: $1"; }
+
+confirm_gate() {
+  : "${DRY_RUN:=1}"
+  : "${REQUIRE_CONFIRM:=1}"
+  : "${CONFIRM_PHRASE:=I UNDERSTAND THIS WILL BROADCAST A BITCOIN TX}"
+  [[ "$DRY_RUN" == "0" ]] || die "DRY_RUN=$DRY_RUN (set DRY_RUN=0)."
+  if [[ "$REQUIRE_CONFIRM" == "1" ]]; then
+    echo "Type to confirm:"
+    echo "  $CONFIRM_PHRASE"
+    read -r input
+    [[ "$input" == "$CONFIRM_PHRASE" ]] || die "Confirmation phrase mismatch."
+  fi
+}
+
+json_escape() {
+  local s="$1"
+  s="${s//\\/\\\\}"; s="${s//\"/\\\"}"; s="${s//$'\n'/\\n}"
+  printf "%s" "$s"
+}
+
+read_root_hex() {
+  : "${ROOT_HEX:=}"
+  : "${ROOT_FILE:=}"
+  if [[ -n "$ROOT_HEX" ]]; then
+    echo "${ROOT_HEX#0x}"
+    return 0
+  fi
+  [[ -n "$ROOT_FILE" ]] || die "Set ROOT_HEX or ROOT_FILE."
+  [[ -f "$ROOT_FILE" ]] || die "ROOT_FILE not found: $ROOT_FILE"
+  rh="$(grep '^root_hex=' "$ROOT_FILE" | head -n1 | cut -d= -f2)"
+  [[ -n "$rh" ]] || die "Could not parse root_hex from ROOT_FILE."
+  echo "${rh#0x}"
+}
+
+net_flag() {
+  : "${BTC_NETWORK:=testnet}"
+  case "$BTC_NETWORK" in
+    mainnet) echo "" ;;
+    testnet) echo "-testnet" ;;
+    signet) echo "-signet" ;;
+    *) die "BTC_NETWORK must be mainnet|testnet|signet" ;;
+  esac
+}
+
+ascii_to_hex() {
+  # portable: use xxd
+  echo -n "$1" | xxd -p -c 256 | tr -d '\n'
+}