crosscheck: mechanical consistency across the yukart repos

Decisions, topics, doc references, deployed binaries and front matter, each
checked against the repo that owns the fact. A reusable workflow runs it from
every repo on push.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DDwfd6Ki8UfG4hK6W5YpJz

caller/crosscheck.yml

@@ -0,0 +1,14 @@
+# Cross-repo consistency (yukart/tool-crosscheck): decisions, topics, doc references,
+# service lists and front matter checked against their source in every yukart repo.
+on:
+  push:
+    branches: [ master ]
+  workflow_dispatch:
+
+jobs:
+  crosscheck:
+    uses: yukart/tool-crosscheck/.gitea/workflows/crosscheck.yml@master
+    with:
+      repo: ${{ github.event.repository.name }}
+      sha: ${{ github.sha }}
+    secrets: inherit