docs: Ledger Live integration, contract deploy learnings, NEXT_STEPS updates

- ADD_CHAIN138_TO_LEDGER_LIVE: Ledger form done; public code review repo bis-innovations/LedgerLive; init/push commands
- CONTRACT_DEPLOYMENT_RUNBOOK: Chain 138 gas price 1 gwei, 36-addr check, TransactionMirror workaround
- CONTRACT_*: AddressMapper, MirrorManager deployed 2026-02-12; 36-address on-chain check
- NEXT_STEPS_FOR_YOU: Ledger done; steps completable now (no LAN); run-completable-tasks-from-anywhere
- MASTER_INDEX, OPERATOR_OPTIONAL, SMART_CONTRACTS_INVENTORY_SIMPLE: updates
- LEDGER_BLOCKCHAIN_INTEGRATION_COMPLETE: bis-innovations/LedgerLive reference

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/utils/dry-run-example.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+# Example --dry-run pattern for deployment/change scripts
+# Recommendation: docs/10-best-practices/RECOMMENDATIONS_AND_SUGGESTIONS.md (§ Script Improvements)
+# Usage: DRY_RUN=1 ./your-script.sh   OR   ./your-script.sh --dry-run
+
+set -euo pipefail
+
+DRY_RUN="${DRY_RUN:-0}"
+for arg in "$@"; do
+  if [[ "$arg" == "--dry-run" || "$arg" == "-n" ]]; then
+    DRY_RUN=1
+    break
+  fi
+done
+
+run_or_echo() {
+  if [[ "$DRY_RUN" == "1" ]]; then
+    echo "[DRY-RUN] Would execute: $*"
+  else
+    "$@"
+  fi
+}
+
+# Example: run_or_echo pct set 106 --memory 8192
+# Example: run_or_echo cp config.toml /opt/besu/
+
+if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
+  echo "DRY_RUN=$DRY_RUN - Use DRY_RUN=1 or --dry-run to preview without executing."
+  run_or_echo echo "Example command (no-op when dry-run)"
+fi