docs(skills): page-builder guide drops the retired page:header breadcrumb and names placedActions

.changeset/30031-page-builder-header-breadcrumb.md

@@ -0,0 +1,10 @@
+---
+'@objectstack/skills': patch
+---
+
+docs(skills): the `page:header` title row drops the retired `breadcrumb` and names the live `placedActions: true`
+
+Clause-②: no
+Metadata-protocol: none
+
+- `skills/objectui/guides/page-builder.md`: the `page:header` sentence named `breadcrumb` among the title row's keys. `PageHeaderProps.breadcrumb` is a `retiredKey` tombstone since @objectstack/spec 17 (ADR-0087 D2), and the props lint refuses an authored one. The row now lists `title`, `subtitle`, `actions` or `placedActions: true`; the last two are refused together.

skills/objectui/guides/page-builder.md

@@ -98,7 +98,7 @@ its own (`page:section` spaces its children with `space-y-4`; `page:footer`
 draws a separator above a justified, muted row; `page:sidebar` is a
 `w-full md:w-80 shrink-0` column, fixed at 20rem from `md` up), and
 `page:header` renders the page's `header`, a title row (`title`, `subtitle`,
-`breadcrumb`, `actions`) that takes no `children`. The bare HTML sectioning
+`actions` or `placedActions: true`) that takes no `children`. The bare HTML sectioning
 tags (`section`, `header`, `nav`, …) are not curated blocks; they belong to
 `kind:'html'` pages.