Build Human-in-Loop

**Description:** Implement configurable human checkpoints at critical decision points including approval gates, review workflows, and feedback integration. The system must support interrupting agent execution loops, collecting human feedback, and dynamically adjusting agent behavior based on that feedback.

**Acceptance Criteria:**

- [ ] Approval gate configuration system with customizable triggers
- [ ] Execution loop interruption mechanism with state preservation
- [ ] Dynamic re-prompting system to incorporate human feedback into agent context
- [ ] Feedback loop integration with prompt rewriting capabilities
- [ ] Rollback mechanisms to revert to previous states based on human decision
- [ ] Timeout handling for human responses with configurable fallback behavior
- [ ] Audit trail for all human decisions with full context capture

**Technical Requirements:**

- Support for both synchronous (blocking) and asynchronous (non-blocking) human review modes
- State serialization for pausing/resuming agent execution across system restarts
- Integration with existing workflow engines (LangGraph) for checkpoint management
- Configurable review policies per agent type, task complexity, and risk level