OpenCode Upgrade Skill: Automating Updates

This is a focused, practical wrapper that encodes the right sequence of commands — brew --repo to find the tap, git -C ... pull --rebase to force-update a custom tap, brew upgrade, hash -r, then opencode --version — and exposes it as a single OpenCode skill. Not revolutionary, but the attention to real pain points (correct tap path across architectures, forcing a tap git pull, refreshing the shell hash and verifying the binary) makes it a handy, low-friction tool for anyone maintaining or using a Homebrew-distributed CLI.