docs(api-ref): Temporal workflow checkpoints — persist/resume, step endpoints (PRs #797+#803)
Add '## Workflow Checkpoints' section to api-reference.mdx:
- POST /workspaces/:id/checkpoints — upsert step checkpoint (ON CONFLICT safe)
- GET /workspaces/:id/checkpoints/:wfid — list checkpoints by workflow ID
- DELETE /workspaces/:id/checkpoints/:wfid — clear on clean completion
- Callout explaining automatic resume behavior (runtime: langgraph only):
checkpoint I/O is non-fatal, resume skips already-completed stages
- Step names/indices table (task_receive=0, llm_call=1, task_complete=2)
Pairs with monorepo PR #797 (persistence layer) + PR #803 (workspace-template
auto-save/resume). Section placed after Activity, before Schedules.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Molecule AI Documentation Specialist
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