Desktop app: slash command autocomplete missing user-created commands

Description

The desktop app (claude.ai/code, v2.1.87) slash command autocomplete dropdown does not show user-created commands from ~/.claude/commands/ or ~/.claude/skills/. The terminal CLI (v2.1.63) correctly shows these commands in the dropdown and prioritizes them above marketplace plugin skills.

Steps to reproduce

1. Create custom skills in ~/.claude/skills/ (with corresponding commands generated in ~/.claude/commands/)
2. Open a session in the terminal CLI — type /w — custom commands like /wf-start, /wc-plan appear in autocomplete ✅
3. Open a session in the desktop app — type /w — only marketplace plugin skills appear (brand-voice, sales, marketing, etc.) ❌

Expected behavior

Desktop app autocomplete should index ~/.claude/commands/ and ~/.claude/skills/ and show user-created commands, ideally before marketplace skills (matching terminal CLI behavior).

Observed behavior

• User commands work when typed fully (the system prompt lists them as available skills, and the Skill tool can invoke them)
• User commands are not discoverable via the / autocomplete dropdown in the desktop app
• The desktop app appears to only read from its internal plugin runtime directory (~/Library/Application Support/Claude/local-agent-mode-sessions/.../rpm/plugin_*/commands/), not from ~/.claude/commands/

Environment

• macOS Darwin 24.2.0
• Terminal CLI: v2.1.63 (works correctly)
• Desktop app: v2.1.87 (missing user commands in autocomplete)
• 32 custom commands in ~/.claude/commands/