fix(commit-commands): use valid git flag -b instead of --branch

[mySebbe]

Summary

• git checkout --branch is not a valid git command — git errors with unknown option 'branch'
• The correct flag for creating a new branch is -b (there is no long-form --branch)
• This prevented /commit-push-pr step 1 ("Create a new branch if on main") from working, as git checkout -b <name> would never match the Bash(git checkout --branch:*) allowed-tools pattern

Fixed in both locations:

• .claude/commands/commit-push-pr.md
• plugins/commit-commands/commands/commit-push-pr.md

Reproduction

$ git checkout --branch test
error: unknown option `branch'
usage: git checkout [<options>] <branch>
   ...
    -b <branch>           create and checkout a new branch

Test plan

• Verified git checkout --branch fails with "unknown option" error
• Verified git checkout -b is the correct flag (confirmed via git checkout --help)
• Updated both command file locations

🤖 Generated with Claude Code