mweinbach2/22/2026, 8:08:54 PM

Split the session monolith into focused modules and keep AgentSession as a composition root/facade.

- Move AgentSession to src/server/session/AgentSession.ts
- Introduce shared SessionContext and SessionRuntimeState types
- Promote HistoryManager, McpManager, and TurnExecutionManager from pass-through wrappers
- Extract SkillManager, SessionMetadataManager, SessionBackupController, and SessionAdminManager
- Keep websocket protocol/handlers unchanged (startServer only updates AgentSession import path)
- Add targeted manager seam tests in test/session.managers.test.ts

Validated with:
- bun test test/session.managers.test.ts test/session.test.ts test/session.stream-pipeline.test.ts test/server.test.ts test/server.toolstream.test.ts

Co-authored-by: Codex <noreply@openai.com>

Parent9c7f4d7