docs(changeset): the 17.6.0 bump's range sentence names the one floor that moves (objectui#11227)

The objectui#11438 changeset said no declared range moves and that
check:spec-floors finds no floor that has to rise. That was true when it
was written and went false once @object-ui/types began reading
EmptyState / EmptyStateSchema, which @objectstack/spec 17.5.0 does not
export. The sentence now names that floor and where it is declared; front
matter untouched, prose only.

Claude-Session: https://claude.ai/code/session_016tKoy8NJa35Yih1FdzrVmn
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

.changeset/11438-objectstack-17-6-bump.md

@@ -4,7 +4,7 @@
 '@object-ui/console': patch
 ---
 
-objectui now resolves `@objectstack/*` 17.6.0 (objectui#11438). No declared range moves: every `@objectstack/*` range already admits 17.6.0, and `check:spec-floors` finds no floor that has to rise. Everything below is a contract move 17.6.0 made, and it already reaches any consumer that resolves `@objectstack/spec ^17.6`.
+objectui now resolves `@objectstack/*` 17.6.0 (objectui#11438). One declared range moves: `@object-ui/types` raises its `@objectstack/spec` floor to `^17.6.0` in objectui#11227's own changeset, because its published types read `EmptyState` / `EmptyStateSchema`, which 17.5.0 does not export. Every other `@objectstack/*` range already admits 17.6.0 and stays as it was, and `check:spec-floors` names no other floor that has to rise. Everything below is a contract move 17.6.0 made, and it already reaches any consumer that resolves `@objectstack/spec ^17.6`.
 
 - `@object-ui/components`: the `page:header` registration no longer publishes a `breadcrumb` input. 17.6.0 retires the key (objectstack#20758) and refuses it by name; the renderer has ignored it since objectui#11166.
 - `@object-ui/i18n`: a served translation document is recognised as a spec payload when it carries only the `picklists` group, which 17.6.0's `GetTranslationsResponseSchema` adds. Such a bundle used to be returned untransformed, so nothing read it. The group is now namespaced under `app` like every other group.