[Feature Request] Agent resumption tracking and history management

Bug Description
Feature: Agent resumption tracking

When using specialized agents via the Task tool (like custom agents defined in .claude/agents/), it would be helpful to have:

1. A way to list recently-used agents: /agents --recent
2. A command to resume the last instance of a named agent: /resume-agent dreamer
3. Or integrate agent history into the existing /resume session picker

Use case: When working with a "brainstorming" agent across multiple sessions, being able to resume with context intact (without manually tracking agent IDs) would make agent-heavy workflows much smoother.

Environment Info

• Platform: darwin
• Terminal: Apple_Terminal
• Version: 2.0.76
• Feedback ID: 425a506b-a783-47a9-bc59-71ca46f6670d

Errors

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