Create new fast commit task

This task uses the same logic as the commit task (.claude/commands/commit.md) but automatically selects the first suggested commit message without asking for confirmation.

Generate 3 commit message suggestions following the same format as the commit task
Automatically use the first suggestion without asking the user
Immediately run git commit -m with the first message
All other behaviors remain the same as the commit task (format, package names, staged files only)