docs: handoff 23 — ADR-0029 complete; tick C3

ADR-0029 (column constraints — NOT NULL / UNIQUE / CHECK /
DEFAULT) is fully implemented across the handoff-22 and
handoff-23 sessions. Ticks requirement C3, and corrects
ADR §10's CHECK-error wording to the compiled-SQL form per
the §7 storage deviation.

docs/adr/0029-column-constraints.md

@@ -365,10 +365,13 @@ The friendly-error layer (ADR-0019) already enriches `NOT
 NULL` and `UNIQUE` violations from `insert` / `update`. Two
 additions:
 
-- **`CHECK` violation** — SQLite reports `CHECK constraint
-  failed`; a new catalog entry renders it as "the value for
-  `<col>` breaks the rule `<check-expr>`", with the offending
-  value and the DSL-form expression.
+- **`CHECK` violation** — the engine reports `CHECK constraint
+  failed: <col>`. The runtime enrichment resolves the column,
+  the offending value, and the column's `CHECK` expression; the
+  catalog entry renders "the value `<v>` breaks the rule
+  `<check-expr>`". The rule is shown in its **compiled-SQL
+  form** (§7) — the same form stored and displayed everywhere,
+  since deviation §7 removed the DSL-text representation.
 - **The §5 / §6 refusals** — populated-column dry-run
   failures, the `not null` / `unique` / `serial+default`
   rejections — are all friendly catalog strings, with the