Check cloud setup

The run's instructions name a branch that adds or changes the repository's setup hook, .tessl/cloud-launch-setup.sh. Run that hook on this machine and say what happened. Change nothing: no commits, no pushes, no pull requests, and no comments.

1. Fetch and check out the branch the instructions name: git fetch origin <branch> and git checkout <branch>. Preparing this run can write files the branch also adds, such as AGENTS.md and CLAUDE.md. If the checkout refuses because untracked files would be overwritten, delete the files it names, check out again, and list them in the summary.
2. Run CI=true bash .tessl/cloud-launch-setup.sh < /dev/null twice from the clone root, keeping each run's full output and exit status. The second run shows the hook is safe to run more than once.
3. Run node --version, python3 --version, go version, bun --version, and docker --version, plus the version command of each tool the hook installs, and keep each output or error.
4. Write launch-result.json at the clone root. When both hook runs exit 0, use status: succeeded with a summary listing each tool and its version. Otherwise use status: failed, a one-sentence summary naming the step that failed, and a reason with the last 20 lines of the failing run's output.