test(types): pin every AnyComponentSchema arm to a named zod export (objectui#8784)

.changeset/8784-arm-named-export-pin.md

@@ -0,0 +1,37 @@
+---
+---
+
+Test-only: pin that every `AnyComponentSchema` arm is a NAMED export of `@object-ui/types/zod`,
+or is ledgered with the reason it is not (objectui#8784). No published source changes, so no
+package is released by this change.
+
+objectui#7917 found two arms with no named export on the barrel — `breadcrumb` and
+`object-tree` were maintained, were applied by the union, and could not be validated on their
+own. PR #8777 repaired both and nothing kept it repaired: `zod-mirror-parity.test.ts` builds
+its export population with `/^export const NAME/m`, which matches a DECLARATION and can never
+match `export { NAME } from './x.js'`, so it is structurally blind to a missing re-export; no
+test pinned a list or a count on `index.zod.ts`; and the one script that does compute the
+census, `scripts/measure-strict-authoring-face.mjs`, is a self-described MEASUREMENT THROWAWAY
+wired into no `package.json` script and no workflow.
+
+The pin derives the arm list on every run — flatten the union recursively through nested
+unions and `z.lazy`, then match each leaf arm to a named export **by identity**. Both
+properties are load-bearing and both are controls in the file rather than claims in a comment:
+a walk that stops at the 13 top-level members — 12 sub-unions plus one object arm
+(`AppComponentSchema`, an arm at depth 1), not 13 sub-unions — scores exactly
+`options.length` arms, and a
+name-based match is satisfied by `export { NavigationSchema as BreadcrumbSchema }` — the
+parent sub-union under the arm's name, which passes every behavioural leg of #8777's pin. No
+count is hard-coded; the only bound asserted against the real union is a floor read off that
+union's own top-level option count.
+
+Red on arrival, reported rather than declared away: `507b61bf7` (PR #8763, objectui#8499)
+armed `SemanticElementSchema`, `HtmlElementSchema`, `InputShorthandSchema` and
+`UiCalendarSchema` in `layout.zod.ts` and `form.zod.ts` and touched no barrel deliberately
+(PR #8763 merged 2026-09-09T08:11:20Z; the omission and its reason are declared in
+`.changeset/8499-node-slot-registered-arms.md`). The
+current reading is 111 arms / 154 `type` literals / 106 named / 5 unnamed. Four of the five
+carry ledger rows against objectui#9067, which holds the ruling, because exporting them mints
+new names on a published surface. The fifth, `RetiredKanbanNodeSchema`, is a refusal arm the
+barrel already declares deliberately internal (objectui#8802). A stale-row leg deletes any
+ledger row the moment its arm is exported or stops existing.