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

packages/opencode/src/session/session.ts

@@ -432,6 +432,12 @@ export interface Interface {
   readonly setTitle: (input: { sessionID: SessionID; title: string }) => Effect.Effect<void>
   readonly setArchived: (input: { sessionID: SessionID; time?: number }) => Effect.Effect<void>
   readonly setMetadata: (input: typeof SetMetadataInput.Type) => Effect.Effect<void>
+  readonly setAgentModel: (input: {
+    sessionID: SessionID
+    agent: string
+    model: NonNullable<Info["model"]>
+    time: number
+  }) => Effect.Effect<void>
   readonly setPermission: (input: { sessionID: SessionID; permission: PermissionV1.Ruleset }) => Effect.Effect<void>
   readonly setRevert: (input: {
     sessionID: SessionID
@@ -760,6 +766,19 @@ export const layer: Layer.Layer<
       yield* patch(input.sessionID, { metadata: input.metadata, time: { updated: Date.now() } }).pipe(Effect.orDie)
     })
 
+    const setAgentModel = Effect.fn("Session.setAgentModel")(function* (input: {
+      sessionID: SessionID
+      agent: string
+      model: NonNullable<Info["model"]>
+      time: number
+    }) {
+      yield* patch(input.sessionID, {
+        agent: input.agent,
+        model: input.model,
+        time: { updated: input.time },
+      }).pipe(Effect.orDie)
+    })
+
     const setPermission = Effect.fn("Session.setPermission")(function* (input: {
       sessionID: SessionID
       permission: PermissionV1.Ruleset
@@ -898,6 +917,7 @@ export const layer: Layer.Layer<
       setTitle,
       setArchived,
       setMetadata,
+      setAgentModel,
       setPermission,
       setRevert,
       clearRevert,