102dff08c4fb99af9b0fcac7c61fa2aeb577726d
ADR-0028 complete (per handoff-21); ADR-0029 (column constraints) written, accepted, and implemented through commit 4 of 6 — NOT NULL / UNIQUE / DEFAULT / CHECK at `create table` and `add column`. Commits 5 (`add constraint` / `drop constraint` + the §5 dry-run) and 6 (friendly errors + typing-surface matrix) are planned in full in §4.
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