Records what shipped in 18c.2 (activation gate, two diagnostic
codes, position model, the new parse_term / term_to_form_a
round-trip in ailang-surface, gate on clean-typecheck), the
three known false negatives that are deliberate scope cuts
(missing-consume-of-Own, lam captures conservative, pattern
bindings start fresh), and the dispatch for 18c.3 (uniqueness
inference + codegen inc/dec — the iter where RC actually starts
collecting memory).
Brummel
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