feat(codex): native plugin install manifests + agents-only converter (#616)

scripts/release/validate.ts

@@ -22,8 +22,9 @@ const result = await syncReleaseMetadata({
   },
 })
 const changed = result.updates.filter((update) => update.changed)
+const metadataErrors = result.errors
 
-if (configErrors.length === 0 && changed.length === 0) {
+if (configErrors.length === 0 && changed.length === 0 && metadataErrors.length === 0) {
   console.log(
     `Release metadata is in sync. compound-engineering currently has ${counts.agents} agents, ${counts.skills} skills, and ${counts.mcpServers} MCP server${counts.mcpServers === 1 ? "" : "s"}.`,
   )
@@ -37,6 +38,13 @@ if (configErrors.length > 0) {
   }
 }
 
+if (metadataErrors.length > 0) {
+  console.error("Release metadata structural errors detected:")
+  for (const error of metadataErrors) {
+    console.error(`- ${error}`)
+  }
+}
+
 if (changed.length > 0) {
   console.error("Release metadata drift detected:")
   for (const update of changed) {