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>

docs/scripts/add-standard-headers.py

@@ -0,0 +1,74 @@
+#!/usr/bin/env python3
+"""Add standard doc header (Last Updated, Document Version, Status, ---) to docs missing it."""
+import os
+import sys
+
+DOCS_DIR = os.path.join(os.path.dirname(__file__), "..")
+HEADER_BLOCK = """
+**Last Updated:** 2026-01-31  
+**Document Version:** 1.0  
+**Status:** Active Documentation
+
+---
+"""
+
+
+def needs_header(path: str) -> bool:
+    try:
+        with open(path, "r", encoding="utf-8", errors="replace") as f:
+            first = f.read(600)
+        return "**Last Updated:**" not in first
+    except Exception:
+        return False
+
+
+def add_header(path: str) -> bool:
+    try:
+        with open(path, "r", encoding="utf-8", errors="replace") as f:
+            lines = f.readlines()
+    except Exception as e:
+        print(f"Read error {path}: {e}", file=sys.stderr)
+        return False
+    if not lines:
+        return False
+    first_500 = "".join(lines[:25])[:500]
+    if "**Last Updated:**" in first_500:
+        return False
+    # Insert after first line (title). Skip one leading --- in rest to avoid double.
+    rest = lines[1:]
+    while rest and rest[0].strip() == "":
+        rest = rest[1:]
+    if rest and rest[0].strip() == "---":
+        rest = rest[1:]
+    new_lines = [lines[0], "\n", "**Last Updated:** 2026-01-31  \n", "**Document Version:** 1.0  \n", "**Status:** Active Documentation\n", "\n", "---\n", "\n"] + rest
+    try:
+        with open(path, "w", encoding="utf-8", newline="\n") as f:
+            f.writelines(new_lines)
+    except Exception as e:
+        print(f"Write error {path}: {e}", file=sys.stderr)
+        return False
+    return True
+
+
+def main():
+    count = 0
+    for root, _dirs, files in os.walk(DOCS_DIR):
+        if "archive" in root.split(os.sep):
+            continue
+        depth = root[len(DOCS_DIR) :].count(os.sep)
+        if depth >= 3:
+            continue
+        for name in files:
+            if not name.endswith(".md"):
+                continue
+            path = os.path.join(root, name)
+            rel = os.path.relpath(path, DOCS_DIR)
+            if needs_header(path) and add_header(path):
+                count += 1
+                print(rel)
+    print(f"\nAdded header to {count} files.", file=sys.stderr)
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())