feat(release): enforce aligned trusted publications

tools/release/govoplan_release/selective_planner.py

@@ -76,6 +76,19 @@ def build_unit(repo: RepositorySnapshot, *, target_version: str | None, contract
         blockers.append(f"repository is behind {repo.upstream}")
     if repo.exists and repo.is_git and not repo.has_head:
         blockers.append("repository has no initial commit")
+    local_versions = tuple(
+        value
+        for value in (
+            repo.versions.pyproject,
+            repo.versions.package,
+            repo.versions.webui_package,
+            *repo.versions.manifests,
+            *repo.versions.package_inits,
+        )
+        if value
+    )
+    if len(set(local_versions)) > 1:
+        blockers.append("backend, manifest, and frontend version metadata is not aligned")
     if repo.dirty:
         warnings.append("uncommitted changes will need review before release")
     if repo.ahead: