effect: add RuntimeFlags service (#27181)

packages/opencode/test/plugin/trigger.test.ts

@@ -10,6 +10,7 @@ import { Auth } from "../../src/auth"
 import { Bus } from "../../src/bus"
 import { Config } from "../../src/config/config"
 import { Env } from "../../src/env"
+import { RuntimeFlags } from "../../src/effect/runtime-flags"
 import { Plugin } from "../../src/plugin/index"
 import { ModelID, ProviderID } from "../../src/provider/schema"
 import { provideTmpdirInstance } from "../fixture/fixture"
@@ -33,7 +34,11 @@ const configLayer = Config.layer.pipe(
 )
 const it = testEffect(
   Layer.mergeAll(
-    Plugin.layer.pipe(Layer.provide(Bus.layer), Layer.provide(configLayer)),
+    Plugin.layer.pipe(
+      Layer.provide(Bus.layer),
+      Layer.provide(configLayer),
+      Layer.provide(RuntimeFlags.layer({ disableDefaultPlugins: true })),
+    ),
     CrossSpawnSpawner.defaultLayer,
   ),
 )