claude@clouddev1
58d8958822
`add column` now accepts the shared constraint suffix and the worker honours it — the surface where NOT NULL / UNIQUE actually matter, on non-PK columns. - Grammar: `ADD_COLUMN_NODES` gains the constraint-suffix fragment; `collect_column_constraints` folds it into `Command::AddColumn`. - `do_add_column` routes per ADR-0029 §6: SQLite's `ALTER TABLE ADD COLUMN` cannot express `UNIQUE` and requires a default for `NOT NULL`, so those go through the rebuild primitive (`do_add_constrained_column_via_rebuild`); plain cases keep the ALTER path with the constraint suffix appended. - Pre-flight refusals, before any SQL write: a NOT NULL column with no default added to a populated table; a UNIQUE column with a default added to a multi-row table; a default on a `serial` / `shortid` column. CHECK is still deferred to the next commit. 1193 tests pass (+9); clippy clean.