test(gate): assert the doc ledger's Node claims against the workflows

.changeset/6400-workflow-version-anchor.md

@@ -0,0 +1,30 @@
+---
+---
+
+Test-only (objectui#6400): the version-claim ledger's `Node 22.x` entries no
+longer restate a hand-written count of `.github/workflows`, they are asserted
+against it.
+
+`scripts/__tests__/doc-version-claims.test.ts` gains a `workflowVersionKey`
+field on `KNOWN_CLAIMS` — the objectui#6400 counterpart to `skeletonDep`. It
+names the GitHub-Actions key (`node-version`) whose declarations across
+`.github/workflows` are a claim's anchor, and a new
+`describe('doc version claims - the workflow-version assertion')` reads those
+declarations on every run and demands the page state their major.
+
+The entry that motivated it was `anchored` and both halves of its reason had
+gone false: it named "the 14 `node-version: 22.x` declarations" against a tree
+holding 28 across 23 files, one of which is spelled `'22'` rather than `'22.x'`,
+and it credited `ci-cd-pipeline-doc.test.ts` with pinning the line when that
+file contains no `node-version` and no `22` at all. The claim itself stayed true
+throughout — what rotted is the sentence a reviewer re-measures it by, which is
+the entire load an `anchored` entry without a machine-checked field carries.
+
+Three entries carry the new field (`ci-cd-pipeline.md`, `building-crud-app.md`,
+`quick-start.md` — all three counts were stale), and none of their reasons
+states a count any more. The comparison is on the **major**, not the spelling,
+so the one lane declaring `'22'` is inside the anchor rather than a blind spot;
+a value the parser cannot read is reported rather than skipped, and the line
+parser is cross-checked against a counter that knows only the key.
+
+No package source changed and nothing is published by this.