Stock macOS ships bash 3.2 (frozen 2007 due to GPLv3) and BSD find.
Both scripts used `mapfile` (bash 4+) and `find -printf` (GNU only),
so a fresh Mac user running `bash scripts/install.sh` died on line 11
before copying anything. Replace with a portable shell glob — same
sort order, no `find` dependency, works on bash 3.2 and 4+.
Verified on git-bash: 16 skills discovered, install dry-run copies all,
`build.sh` produces a valid archive.
See .wiki/concepts/install-portability.md for the full gotcha.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
