Add the sub-phase 4a implementation plan (docs/plans/), test-first,
mirroring the ADR-0033 DML sub-phase model: SqlCreateTable as its own
command executed structurally through the existing do_create_table
helper; shared-entry-word dispatch (SQL-first, simple fallback); the
type-alias resolver; IF NOT EXISTS no-op-with-note (CreateOutcome
enum); INTEGER PRIMARY KEY -> plain int; one-undo-step wiring.
Records the user-confirmed 4a/4a.2 split: composite UNIQUE(a,b) and
multi-column table CHECK move to a dedicated slice because they are the
first structures TableSchema cannot already represent, so they need a
persistence-model + round-trip extension rather than parse+execute
reuse. ADR-0035 §13 gains 4a.2; README sub-phase line updated in
lockstep.
claude@clouddev1