Manual verify: Human members (#36) #421

Feature: Human team members — coordinator routing to human members for approval/review.

Why manual verification needed:

• Requires real human interaction simulation
• Involves coordinator → human handoff logic
• Hard to test approval workflows without actual user input

Test approach:

1. Define a team with both AI agents and human members in team.md
2. Create a routing rule that targets a human member
3. Submit work that matches the human routing rule
4. Verify coordinator routes to human (not an AI agent)
5. Test notification/alert mechanisms for human attention needed
6. Verify work queue behavior when humans are unavailable
7. Test handoff back to AI agents after human approval

Success criteria:

• ✅ Coordinator correctly identifies human members vs AI agents
• ✅ Routing rules work for human targets
• ✅ Notifications are sent when human input is required
• ✅ Work doesn't get stuck when humans are unavailable
• ✅ Handoff from human → AI agent works seamlessly

Related: Issue #36