Project agents: only first alphabetical file loaded from .claude/agents/

Bug Description

When placing multiple custom subagent files in .claude/agents/, only the alphabetically first file is loaded. All other agent files are silently ignored.

Steps to Reproduce

1. Create multiple agent files in .claude/agents/:

• .claude/agents/aaa_agent.md
• .claude/agents/didi.md
• .claude/agents/ronny.md

1. Start a new Claude Code session
2. Open /agents dialog

Expected Behavior

All agent files in .claude/agents/ appear under "Project agents".

Actual Behavior

Only the alphabetically first file appears. Renaming a file to be alphabetically earlier causes it to replace the previously shown agent.

Verification

• Confirmed alphabetical ordering: renaming zzz_test.md → aaa_test.md caused aaa_test to appear instead of didi
• All files have valid YAML frontmatter (name + description)
• touch-ing files and restarting does not help
• No errors shown anywhere
• Created 5 agent files in one batch — only the alphabetically first was ever loaded

Environment

• OS: Windows 11 Pro
• Project path: network/mapped drive (P:\)
• Claude Code: Desktop App (latest)

Workaround

None available for shared network setups. User-level ~/.claude/agents/ works on single-machine setups but not when the project directory is shared across multiple machines.