Agent Tree Command

[szmania]

Summary

Adds a new /agent-tree command that displays the hierarchy of active agents in a tree format.

Changes

• New file: cecli/commands/agent_tree.py (95 lines)
  • TreeNode class — represents a node in the agent hierarchy tree with parent-child relationships
  • AgentTreeCommand — the /agent-tree command implementation
    • Collects the primary coder and all sub-agents from the AgentService
    • Builds a tree structure by linking agents via parent_uuid
    • Renders the tree with Unicode box-drawing characters (├──, └──, │)
    • Displays agent name, status, and UUID for each node

Design

• Uses the existing SubAgentInfo and AgentService infrastructure
• Builds a tree from the flat list of agents by resolving parent_uuid relationships
• Renders output using standard tree-drawing characters for readability
• Gracefully handles cases with no sub-agents (shows "No active sub-agents found.")

Testing

• Manual testing via /agent-tree command in agent mode
• Verified correct tree rendering with nested agent hierarchies

[szmania]

This is ready, not sure what this failure is, a dependency?