Merge pull request #49 from KestrelAI/add-rollback-and-replay-docs

docs: add workflow rollback and execution replay documentation

Author: ramanv0

docs/workflows/cli.mdx

@@ -170,6 +170,22 @@ kestrel approvals approve <approval-id> --justification "Emergency fix"
 kestrel approvals reject <approval-id>
 ```
 
+## Version History & Rollback
+
+```bash
+kestrel workflows versions <workflow-id>              # List version history
+kestrel workflows rollback <workflow-id> --version 3  # Roll back to version 3
+```
+
+## Execution Replay
+
+Replay failed executions from the beginning or from the failed step:
+
+```bash
+kestrel workflows replay <execution-id>                   # Replay from beginning
+kestrel workflows replay <execution-id> --from-failed     # Replay from failed step
+```
+
 ## Request Commands
 
 ```bash

docs/workflows/sdk.mdx

@@ -444,6 +444,34 @@ client.approvals.approve("approval-id", justification="Looks good")
 client.approvals.reject("approval-id")
 ```
 
+## Version History & Rollback
+
+```python
+# List version history
+versions = client.workflows.list_versions("workflow-id")
+for v in versions["versions"]:
+    print(f"v{v['version_number']} — {v['change_summary']} ({v['created_at']})")
+
+# Roll back to a previous version
+client.workflows.rollback("workflow-id", version=3)
+```
+
+## Execution Replay
+
+Replay failed executions from the beginning or from the failed step:
+
+```python
+# Replay from beginning (re-triggers with same signal data)
+new_exec = client.executions.replay("execution-id", mode="full")
+
+# Replay from failed step (preserves outputs from prior steps)
+new_exec = client.executions.replay("execution-id", mode="from_failed")
+
+# Wait for replay to complete
+result = client.executions.wait(new_exec.id)
+print(f"Replay status: {result.status}")
+```
+
 ## Error Handling
 
 ```python