feat(agent): export InMemorySessionStorage and JsonlSessionStorage

Export both session storage implementations from @earendil-works/pi-agent-core
so they can be imported and extended directly instead of via repo workaround.

closes #6435

packages/agent/CHANGELOG.md

@@ -5,6 +5,7 @@
 ### Added
 
 - Added configurable harness session context entry transforms and custom-entry message projectors.
+- Exported `InMemorySessionStorage` and `JsonlSessionStorage` ([#6435](https://github.com/earendil-works/pi/issues/6435)).
 
 ### Fixed
 

packages/agent/src/index.ts

@@ -28,7 +28,9 @@ export {
 export * from "./harness/messages.ts";
 export * from "./harness/prompt-templates.ts";
 export * from "./harness/session/jsonl-repo.ts";
+export * from "./harness/session/jsonl-storage.ts";
 export * from "./harness/session/memory-repo.ts";
+export * from "./harness/session/memory-storage.ts";
 export * from "./harness/session/repo-utils.ts";
 export * from "./harness/session/session.ts";
 export { uuidv7 } from "./harness/session/uuid.ts";