Refactor plugin/config loading, add theme-only plugin package support (#20556)

packages/opencode/src/cli/cmd/plug.ts

@@ -115,7 +115,9 @@ export function createPlugTask(input: PlugInput, dep: PlugDeps = defaultPlugDeps
       if (manifest.code === "manifest_no_targets") {
         inspect.stop("No plugin targets found", 1)
         dep.log.error(`"${mod}" does not expose plugin entrypoints in package.json`)
-        dep.log.info('Expected one of: exports["./tui"], exports["./server"], or package.json main for server.')
+        dep.log.info(
+          'Expected one of: exports["./tui"], exports["./server"], package.json main for server, or package.json["oc-themes"] for tui themes.',
+        )
         return false
       }