execute-plan.md command now spawns subagent instead of executing directly:
- Loads only subagent-task-prompt template (~100 lines vs ~2200)
- Subagent loads full execute-plan workflow, summary, checkpoints, tdd
- Handles checkpoint returns with resume flow
- ~80% context reduction for orchestrator
Also updated subagent-task-prompt.md description to clarify it's used by
both execute-phase (parallel) and execute-plan (single) orchestrators.
Co-Authored-By: Claude <noreply@anthropic.com>
8ed6a8fa50