burn-down Part B: 14 small rows fixed and closed across four repos (306 -> 292); no :latest in the hub build; gate list pinned; closed-id duplicates refused; R-262 subset pinned

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

scripts/test_repo_gates_docstring.py

@@ -0,0 +1,21 @@
+#!/usr/bin/env python3
+"""R-418: repo_gates.py's docstring list of gates names exactly the gates in GATES, in the same order.
+It drifted twice (eleven listed while thirteen ran, 2026-08-24..09-01; then fifteen while seventeen ran). Run:
+python3 scripts/test_repo_gates_docstring.py"""
+import os
+import re
+import sys
+
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+import repo_gates  # noqa: E402
+
+listed = re.findall(r"^ {1,3}\d+b?\. +([a-z][a-z0-9-]+) ", repo_gates.__doc__, re.M)
+registered = [g[0] for g in repo_gates.GATES]
+if listed != registered:
+    print("FAIL: the docstring lists %d gate(s), GATES registers %d" % (len(listed), len(registered)))
+    print("  only listed:     %s" % sorted(set(listed) - set(registered)))
+    print("  only registered: %s" % sorted(set(registered) - set(listed)))
+    if set(listed) == set(registered):
+        print("  (same set, different order)")
+    sys.exit(1)
+print("OK: the docstring lists the %d registered gates, in order" % len(registered))