C24 gains the add-op args clause and the data-driven format-version
paragraph (tier-2 discipline with id-stability); C15's current state
records Session as args-authorable; the glossary defines construction
arg and arg kind (and de-stales the session-node entry to aura-market);
the authoring guide fixes the moved roster path, extends the
Session-anchoring section with the args path, and teaches the add-op
args row; the README op-list sentence notes args on arg-bearing types.
refs #271
claude
bc8fb46110