[BUG] Agents are not stored.

Environment

• Platform (select one):
• [ ] Anthropic API
• [ ] AWS Bedrock
• [ ] Google Vertex AI
• [ ] Other: <!-- specify -->
• Claude CLI version: <!-- output of claude --version --> 1.0.70
• Operating System: <!-- e.g. macOS 14.3, Windows 11, Ubuntu 22.04 --> MacOS 15.5
• Terminal: <!-- e.g. iTerm2, Terminal App --> Warp

Bug Description

<!-- A clear and concise description of the bug --> Create a few subagents in Claude Code. But none of these agents are stored. No agents are displayed when /agent is typed.

Steps to Reproduce

1. <!-- First step -->
2. <!-- Second step -->
3. <!-- And so on... -->

Expected Behavior

<!-- What you expected to happen -->

Actual Behavior

<!-- What actually happened -->

Additional Context

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