Inconsistent name prefix handling between commands and skills

Description

Commands and skills handle the name: field in YAML frontmatter inconsistently. When a command has a prefixed name like name: my-plugin:test, the prefix gets stripped. But skills with the same pattern retain the full name.

Example

Command (prefix stripped)

# my-plugin/commands/test.md
---
name: my-plugin:test
description: Test command
---

Expected: Command appears as /my-plugin:test
Actual: Command appears as /test (prefix stripped)

Skill (prefix retained)

# my-plugin/skills/stories/SKILL.md
---
name: my-plugin:stories
description: Stories skill
---

Expected: Skill appears as /my-plugin:stories
Actual: Skill appears as /my-plugin:stories ✓

Impact

• Confusing for plugin developers
• Inconsistent behavior for identical YAML patterns
• Difficult to predict how names will appear to users

Expected Behavior

Commands and skills should handle the name: field identically. Either both should strip/add prefixes automatically, or both should use the name exactly as specified.

Environment

• OS: macOS Darwin 25.2.0
• Date: 2026-01-26