Add /commit as a built-in skill

Feature Request

Description

Add /commit as a built-in skill (slash command) in Claude Code. Currently, typing /commit returns "Unknown skill: commit".

Motivation

Committing changes is one of the most common operations during a Claude Code session. A dedicated /commit skill would provide a convenient shorthand that:

• Stages relevant changed files
• Generates a concise commit message based on the diff
• Creates the commit

Current Workaround

Users must explicitly ask Claude to "commit this" in natural language, which works but is less discoverable than a slash command.

Expected Behavior

/commit would trigger Claude to review the current changes (git status / git diff), draft an appropriate commit message, and create the commit — similar to how it behaves when asked in natural language, but as a first-class slash command.