refactor: narrow synchronous extension contracts

packages/subagent/subagent-inprocess/src/structured.ts

@@ -149,7 +149,7 @@ export function attachStructuredRuntime(childCtx: Context, schema: StructuredOut
   // The capture COMMIT observes the immutable, authoritative result after the
   // complete pipeline and outer error normalization. This notification cannot
   // transform the outcome, so there is no wrapper outside the commit verdict.
-  childCtx.on('tools/result', function (this: unknown, exec, result): void {
+  childCtx.on('tools/result', function (this: unknown, exec, result) {
     if (exec.name === STRUCTURED_OUTPUT_TOOL) {
       const entry = staged.get(exec)
       if (entry === undefined) return

packages/subagent/subagent-inprocess/tests/structured.spec.ts

@@ -742,7 +742,7 @@ describe('in-process structured output', () => {
       const run = await ctx.subagents.start('spawn', structuredRequest(parent))
       // A backend hot-reload mid-run must not unregister the capture tool out
       // from under the live child: the registration rides the CHILD's fiber.
-      await disposeProvider()
+      disposeProvider()
       const result = await run.result
       expect(result.structured).toEqual({ answer: 4 })
       const child = ctx.agents.get(run.id)!