bottler: simplify config, add parallel uploads, fix hyphenated names
- Simplify homebrew.yml: use `target` path instead of package/exe_name
- Rename prune to pruner (avoid conflict with graphviz)
- Add parallel uploads with rclone --transfers 16
- Fix hyphenated name parsing (git-mono was parsed as "git")
- Add timing output for build/upload/tap update steps
- Add dry-run command to preview build targets