- MANAGED_EXTERNALS (emil-design-eng, frontend-design,
design-motion-principles, impeccable) + MANAGED_MCPS (magic):
cmd_set now trims both when the profile does not list them —
design leftovers no longer survive a 'set backend'
- cmd_set refactored to 4 symmetric trim helpers; nothing outside
the MANAGED_* allowlists is ever auto-toggled (darwin-skill manual)
- enable_skill external: from-source fallback (ln -sf
skills-external/<name>), mirrors toggle-external.sh
- stale usage() NOTE + SKILL.md updated to the both-ways reality
- hermetic test: 16 checks, fixture repo + fake claude shim (gstack
on-demand, from-source, park/restore, magic add/remove, non-managed
untouched); shellcheck + full make test green
