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

packages/opencode/test/fixture/tui-runtime.ts

@@ -6,14 +6,14 @@ type PluginSpec = string | [string, Record<string, unknown>]
 
 export function mockTuiRuntime(dir: string, plugin: PluginSpec[]) {
   process.env.OPENCODE_PLUGIN_META_FILE = path.join(dir, "plugin-meta.json")
-  const plugin_records = plugin.map((item) => ({
-    item,
+  const plugin_origins = plugin.map((spec) => ({
+    spec,
     scope: "local" as const,
     source: path.join(dir, "tui.json"),
   }))
   const get = spyOn(TuiConfig, "get").mockResolvedValue({
     plugin,
-    plugin_records,
+    plugin_origins,
   })
   const wait = spyOn(TuiConfig, "waitForDependencies").mockResolvedValue()
   const cwd = spyOn(process, "cwd").mockImplementation(() => dir)