feat(core): add embedded v2 session runtime and tool foundation (#30632)

packages/core/src/location.ts

@@ -1,18 +1,19 @@
 import { Context, Effect, Layer, Schema } from "effect"
 import { Project } from "./project"
 import { AbsolutePath } from "./schema"
+import { WorkspaceV2 } from "./workspace"
 
 export * as Location from "./location"
 
 export const Ref = Schema.Struct({
   directory: AbsolutePath,
-  workspaceID: Schema.optional(Schema.String),
+  workspaceID: Schema.optional(WorkspaceV2.ID),
 }).annotate({ identifier: "Location.Ref" })
 export type Ref = typeof Ref.Type
 
 export interface Interface {
   readonly directory: AbsolutePath
-  readonly workspaceID?: string
+  readonly workspaceID?: WorkspaceV2.ID
   readonly project: {
     readonly id: Project.ID
     readonly directory: AbsolutePath