Adds plan approval workflow per GitHub issue #111:
- Register plan_approval tool in tools index
- Add plan approval handling in message handler
- Check for pending plans on each message
- Detect approval/rejection messages
- Handle plan approval flow
- Create plan approval modal TUI component
- Update system prompts to instruct agents to use plan_approval tool
- Balanced tier: Updated to require plan_approval for complex tasks
- Thorough tier: Updated with plan_approval workflow
Workflow:
1. Agent analyzes task complexity with plan_approval
2. Agent creates plan with steps, context, risks
3. Agent submits plan for user approval
4. User approves/rejects/provides feedback
5. Only after approval, agent proceeds with execution
Closes#111
Carlos Gutierrez
f8cde24d87