rayhpeng e8f087cb37 feat(paths): add user-aware path methods with optional user_id parameter
Add _validate_user_id(), user_dir(), user_memory_file(), user_agent_memory_file()
and optional keyword-only user_id parameter to all thread-related path methods.
When user_id is provided, paths resolve under users/{user_id}/threads/{thread_id}/;
when omitted, legacy layout is preserved for backward compatibility.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-04-12 10:50:11 +08:00
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