portability-check

# /portability-check Sweep the marketplace for portability hazards across the three targets: macOS (bash 3.2 / BSD coreutils), Linux, and Windows Git Bash. ## Before you start Read `${CLAUDE_PLUGIN_ROOT}/knowledge/marketplace-conventions.md` (§4). ## Procedure 1. **Run the sweep.** `bash scripts/portability-check.sh` — verifies every `*.sh` has a `#!/usr/bin/env bash` shebang and runs `shellcheck -x -S warning`. 2. **bash 3.2 hazards.** Beyond shellcheck, grep shipped + dev scripts for constructs that break on macOS's bash 3.2 and report each hit: `mapfile`, `readarray`, `declare -A`, `${var,,}` / `${var^^}`, `wait -n`, and bare `"${arr[@]}"` under `set -u` (use `${arr[@]+"${arr[@]}"}`). 3. **BSD-vs-GNU hazards.** Grep for `readlink -f`, `sed -i` (without backup arg), `date +%N`, `stat -c`, `find -printf`, `timeout`, `base64 -w`; flag each as needing a guard or fallback. 4. **install.sh guards.** For each `plugins/*/install.sh`, confirm it detects Windows-without-Git-Bash (a `uname -s` case matching `MINGW*/MSYS*/CYGWIN*` vs native Windows) and tells the user to install Git Bash. 5. **Report.** List every hit with file:line and the portable replacement. Offer to apply fixes.