docs: lead IP records with attribution answer

scripts/validate.py

@@ -119,8 +119,10 @@ def main() -> int:
         ROOT / "docs" / "02-first-round-investigation.md",
         ROOT / "address-book" / "README.md",
         ROOT / "address-book" / "ip-addresses.md",
+        ROOT / "address-book" / "ip" / "TEMPLATE.md",
         ROOT / "docs" / "04-ip-address-model.md",
         ROOT / "registry-ips" / "README.md",
+        ROOT / "registry-ips" / "TEMPLATE.md",
         ROOT / "registry-ips" / "000-000-000-000--08--iana.md",
         ROOT / "registry-ips" / "001-000-000-000--16--placeholder.md",
         ROOT / "registry-ips" / "001-001-000-000--24--placeholder.md",
@@ -131,6 +133,22 @@ def main() -> int:
         if not path.is_file():
             errors.append(f"missing required document: {path.relative_to(ROOT)}")
 
+    range_records = sorted((ROOT / "registry-ips").glob("*.md"))
+    for path in range_records:
+        if path.name in {"README.md", "TEMPLATE.md"}:
+            continue
+        headings = [line.strip() for line in path.read_text(encoding="utf-8").splitlines() if line.startswith("## ")]
+        if not headings or headings[0] != "## Who is this IP range?":
+            errors.append(f"{path.relative_to(ROOT)}: first section must be '## Who is this IP range?'")
+
+    address_records = sorted((ROOT / "address-book" / "ip").glob("*.md"))
+    for path in address_records:
+        if path.name == "TEMPLATE.md":
+            continue
+        headings = [line.strip() for line in path.read_text(encoding="utf-8").splitlines() if line.startswith("## ")]
+        if not headings or headings[0] != "## Who is this IP?":
+            errors.append(f"{path.relative_to(ROOT)}: first section must be '## Who is this IP?'")
+
     if errors:
         print("Validation failed:")
         for error in errors: