chore(spec): regenerate authorable-surface and reference docs for object-kanban limit

`pnpm --filter @objectstack/spec build` (gen:schema) adds the
`ui/ObjectKanbanProps:limit` row to `authorable-surface/ui.json`;
`check:generated` proved only `content/docs/references/**` stale and
`gen:docs` regenerated it. No `api-surface/` shard moves — a key on an
existing props map adds no export.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01T6HeZvT9wdSJD1ZxJb5Eno

Author: claude

content/docs/references/ui/component.mdx

@@ -457,6 +457,7 @@ Sort field and direction pair
 | **groupBy** | `string` | optional | Field whose values become the board columns |
 | **columns** | `any[]` | optional | Swimlane definitions (`{ id, title }` per `groupBy` value, or bare value strings) — NOT a field projection |
 | **filter** | `any` | optional | Base query filter, handed to the wire `$filter` |
+| **limit** | `integer` | optional | Maximum number of records loaded onto the board (row cap); lowered to the query's top-level `$top` (renderer default 100). The component-level `dataSource.limit` wins when both are set; a bound view's `pagination.pageSize` fills it only when unset |
 | **data** | `any[]` | optional | Static inline cards — bypasses the object query |
 | **cardTitle** | `string` | optional | Field rendered as each card title |
 | **titleField** | `string` | optional | Legacy fallback for `cardTitle` (the board reads `cardTitle \|\| titleField`). Prefer `cardTitle` |

packages/spec/authorable-surface/ui.json

@@ -778,6 +778,7 @@
     "ui/ObjectKanbanProps:filter",
     "ui/ObjectKanbanProps:groupBy",
     "ui/ObjectKanbanProps:grouping",
+    "ui/ObjectKanbanProps:limit",
     "ui/ObjectKanbanProps:objectName",
     "ui/ObjectKanbanProps:quickAdd",
     "ui/ObjectKanbanProps:swimlaneField",