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>

merkle-forest/scripts/00_preflight.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+set -euo pipefail
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+SKILL_ROOT="$(dirname "$SCRIPT_DIR")"
+source "$SCRIPT_DIR/_common.sh"
+
+: "${INPUT_DIR:=}"
+: "${INPUT_FILES:=}"
+: "${OUTPUT_DIR:=$SKILL_ROOT/outputs}"
+
+main() {
+  need find; need sort; need awk; need wc; need tr
+  pick_hasher >/dev/null
+  if [[ -z "$INPUT_DIR" && -z "$INPUT_FILES" ]]; then die "Set INPUT_DIR or INPUT_FILES."; fi
+  if [[ -n "$INPUT_DIR" && ! -d "$INPUT_DIR" ]]; then die "INPUT_DIR not a directory: $INPUT_DIR"; fi
+  mkdir -p "$OUTPUT_DIR/runs"
+  log_info "Preflight OK."
+}
+main "$@"