refactor(opencode): stop legacy v2 event emission (#33993)

packages/opencode/test/session/compaction.test.ts

@@ -854,12 +854,12 @@ describe("session.compaction.process", () => {
       const msg = yield* createUserMessage(session.id, "hello")
       const msgs = yield* ssn.messages({ sessionID: session.id })
       const done = yield* Deferred.make<void, Error>()
-      let seen = false
+      const seen: string[] = []
       const unsub = yield* events.listen((evt) => {
+        seen.push(evt.type)
         if (evt.type !== SessionCompaction.Event.Compacted.type) return Effect.void
         if ((evt.data as typeof SessionCompaction.Event.Compacted.data.Type).sessionID !== session.id)
           return Effect.void
-        seen = true
         Deferred.doneUnsafe(done, Effect.void)
         return Effect.void
       })
@@ -874,7 +874,8 @@ describe("session.compaction.process", () => {
 
       yield* Deferred.await(done).pipe(Effect.timeout("500 millis"))
       expect(result).toBe("continue")
-      expect(seen).toBe(true)
+      expect(seen).toContain(SessionCompaction.Event.Compacted.type)
+      expect(seen.filter((type) => type.startsWith("session.next."))).toEqual([])
     }),
   )