Reference exp_roles and exp_groups from the exp_scenario build

exp_scenario imports types from @expcluster/roles and
@expcluster/permission-groups through their dist folders, so building it
on its own before those packages are built fails with TS2307. A plain
pnpm install runs the prepare scripts in dependency order, but a filtered
install or running tsc --build in exp_scenario on a fresh clone does not.
Referencing the node projects of both packages makes tsc build them first.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

exp_scenario/tsconfig.node.json

@@ -1,5 +1,9 @@
 {
 	"extends": "../tsconfig.node.json",
+	"references": [
+		{ "path": "../exp_groups/tsconfig.node.json" },
+		{ "path": "../exp_roles/tsconfig.node.json" },
+	],
 	"include": ["./**/*.ts"],
 	"exclude": ["test/*", "./dist/*"],
 }