fix(session): hide pending admission sequence

packages/core/test/plugin/promise.test.ts

@@ -62,7 +62,6 @@ describe("fromPromise", () => {
             seen = value
             return Effect.succeed(
               SessionPending.Synthetic.make({
-                admittedSeq: 1,
                 id: SessionMessage.ID.make(input.id),
                 sessionID: Session.ID.make(input.sessionID),
                 timeCreated: DateTime.makeUnsafe(0),

packages/core/test/session-create.test.ts

@@ -484,7 +484,6 @@ describe("Session.create", () => {
           type: "user",
           data: { text: "Replay lifecycle" },
           delivery: "steer",
-          admittedSeq: 1,
         })
         expect(yield* store.context(created.id)).toEqual([])