/ship skill under Codex uses Claude as co-author in commit message

[TBMoonwalker]

Problem

When you using GStack with Codex (installed with the new Codex settings) the wrong Co-Author commit message is created:

git commit -m "$(cat <<'EOF'
chore: bump version and changelog (vX.Y.Z.W)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
EOF
)"

Root cause

The commit message is hardcoded in the SKILL.md from gstack-ship.

Impact

Wrong commit messages are pushed to GIT if someone uses Codex as coding environment

Suggested fix

Change the markdown file so that the right Co-Author is used depending on the currently active environment.