v1.23.1 — agent-sync

• test/family_gate.py, the family's canonical member gate (hub B-108, B-109): the board
  parses (every row as wide as its header, no id twice) and release.yml keeps the tag-ancestry
  check (fetch-depth: 0, git merge-base --is-ancestor), each watched failing on a plant by
  --self-test. Wired into the gate; a byte-for-byte copy of the hub's member-gate/family_gate.py.