- execute-plan.md: Replace broken Task(resume=...) with fresh continuation agent
- execute-phase.md: Expand checkpoint handling with full continuation flow
- checkpoints.md: Restore ~500 lines of detailed examples and anti-patterns
Checkpoint presentation formats now documented for all three types.
Templates referenced: checkpoint-return.md, continuation-prompt.md
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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