Xubin Ren c8d834a504 fix(loop): document subagent-followup persistence and guard empty content
- Add inline rationale for persisting before ContextBuilder and for
  passing current_message="" on subagent follow-ups (avoids
  double-projection after merge).
- Skip persistence for empty subagent content (no-op messages should
  not pollute history).
- Add regression test covering the empty-content guard.

Made-with: Cursor
2026-04-18 13:30:22 +08:00
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