refactor(agent): expose concrete harness session

packages/agent/src/harness/session/repo/shared.ts

@@ -1,6 +1,6 @@
 import { v7 as uuidv7 } from "uuid";
-import type { Session, SessionMetadata, SessionStorage, SessionTreeEntry } from "../../types.js";
-import { DefaultSession } from "../session.js";
+import type { SessionMetadata, SessionStorage, SessionTreeEntry } from "../../types.js";
+import { Session } from "../session.js";
 
 export function createSessionId(): string {
 	return uuidv7();
@@ -11,7 +11,7 @@ export function createTimestamp(): string {
 }
 
 export function toSession<TMetadata extends SessionMetadata>(storage: SessionStorage<TMetadata>): Session<TMetadata> {
-	return new DefaultSession(storage);
+	return new Session(storage);
 }
 
 export async function getEntriesToFork(

packages/agent/src/harness/session/session.ts

@@ -9,7 +9,6 @@ import type {
 	LabelEntry,
 	MessageEntry,
 	ModelChangeEntry,
-	Session,
 	SessionContext,
 	SessionInfoEntry,
 	SessionMetadata,
@@ -75,7 +74,7 @@ export function buildSessionContext(pathEntries: SessionTreeEntry[]): SessionCon
 	return { messages, thinkingLevel, model };
 }
 
-export class DefaultSession<TMetadata extends SessionMetadata = SessionMetadata> implements Session<TMetadata> {
+export class Session<TMetadata extends SessionMetadata = SessionMetadata> {
 	private storage: SessionStorage<TMetadata>;
 
 	constructor(storage: SessionStorage<TMetadata>) {