warn only and ignore plugins without entrypoints, default config via exports (#20284)

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

@@ -114,8 +114,8 @@ export function createPlugTask(input: PlugInput, dep: PlugDeps = defaultPlugDeps
 
       if (manifest.code === "manifest_no_targets") {
         inspect.stop("No plugin targets found", 1)
-        dep.log.error(`"${mod}" does not declare supported targets in package.json`)
-        dep.log.info('Expected: "oc-plugin": ["server", "tui"] or tuples like [["tui", { ... }]].')
+        dep.log.error(`"${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.')
         return false
       }