refactor(schema): extract shared public schemas (#33571)

packages/core/src/session.ts

@@ -2,6 +2,7 @@ export * as SessionV2 from "./session"
 export * from "./session/schema"
 
 import { DateTime, Effect, Layer, Schema, Context, Stream } from "effect"
+import { ListAnchor } from "@opencode-ai/schema/session"
 import { and, asc, desc, eq, gt, like, lt, or, type SQL } from "drizzle-orm"
 import { ProjectV2 } from "./project"
 import { WorkspaceV2 } from "./workspace"
@@ -38,12 +39,7 @@ import { SessionInput } from "./session/input"
 //   - by subpath
 // - by workspace (home is special)
 
-export const ListAnchor = Schema.Struct({
-  id: SessionSchema.ID,
-  time: Schema.Finite,
-  direction: Schema.Literals(["previous", "next"]),
-})
-export type ListAnchor = typeof ListAnchor.Type
+export { ListAnchor }
 
 const ListInputBase = {
   workspaceID: WorkspaceV2.ID.pipe(Schema.optional),