feat(acp): support persistent checkpointer/sessions and relax visibility

[无心戈 (wanxger)]

Summary

Add persistent session/checkpointer support to the ACP server and relax visibility for extensibility.

Changes

feat: persistent checkpointer and sessions (types.ts, server.ts)

• Added optional checkpointer option — allows passing a custom BaseCheckpointSaver (e.g. SqliteSaver) to persist conversation history across server restarts. Defaults to MemorySaver.
• Added optional sessions option — allows passing a custom Map<string, SessionState> for persisting session metadata. Defaults to in-memory Map.
• handleLoadSession() now re-creates the agent on demand when recovering a session after server restart.

fix: guard sessions.clear() against persistent sessions (server.ts)

• stop() no longer calls sessions.clear() when a custom sessions map was provided, preventing accidental data loss.

refactor: relax visibility from private to protected (server.ts)

• Fields: agents, agentConfigs, sessions, checkpointer, acpBackends
• Methods: createAgentHandler(), handleLoadSession(), createAgent(), log()
  These changes enable subclassing DeepAgentsServer to customize behavior.

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Latest commit: 9b60d3b

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commit: 9b60d3b