VS Code extension does not render skill argument-hint in slash menu (works in terminal)

Description

User-invocable skills (user-invocable: true) that declare an argument-hint in their SKILL.md frontmatter do not show the gray hint text in the slash-command menu when using the VS Code extension. The exact same skill shows the hint correctly in the standalone terminal Claude Code.

Steps to reproduce

1. Create a skill ~/.claude/skills/my_skill/SKILL.md with frontmatter name, description, user-invocable: true, and argument-hint: "[some hint]".
2. In the terminal CLI, type /my_skill → the gray [some hint] appears. ✅
3. In the VS Code extension, type /my_skill → no gray hint appears. ❌ (the skill itself is listed and invokable)

Expected

The argument-hint should render in the VS Code extension's slash menu, same as in the terminal.

Environment

• Claude Code: 2.1.45
• OS: Windows 11 Pro (10.0.26200)
• Surface: VS Code extension vs standalone terminal

Notes

Reproduced across multiple skills. Custom commands' argument-hint rendering should be checked as well. This is not a frontmatter problem — the identical file works in the terminal.