CLI: wildgecu agent list and agent remove

[ludusrusso]

Parent PRD

#34

What to build

Two CLI commands for managing static agents:

• wildgecu agent list — Scans agents/ and prints each agent's name, configured model, and whether it has a SOUL.
• wildgecu agent remove <name> — Deletes the named agent's directory after user confirmation.

Acceptance criteria

• wildgecu agent list shows all agents with name and model
• wildgecu agent list handles empty agents directory gracefully
• wildgecu agent remove <name> deletes the agent directory
• wildgecu agent remove asks for confirmation before deleting
• wildgecu agent remove errors if agent doesn't exist

Blocked by

• Blocked by Home.Agent: directory scaffolding for static subagents #41 (Home.Agent directory scaffolding)
• Blocked by Agent config.yaml: parsing and model resolution #42 (agent config.yaml parsing)

User stories addressed

• User story 2 (list agents)
• User story 3 (remove agent)