`enable <tool>` for npx/external skills (darwin-skill, find-skills,
emil-design-eng) only handled two states: symlink in skills-disabled/
(move) and symlink in skills/ (already enabled). Missed the state
right after `make plugin` where the source dir exists at
~/.agents/skills/<tool> but no symlink has been created yet — first
run errored "not installed — run: make plugin" misleadingly.
Add a third branch: when the resolved source dir exists, create the
symlink in place. Resolve source path per tool (skills-external for
emil-design-eng, ~/.agents/skills for darwin-skill/find-skills). Error
message now names the path checked so the caller can verify install
vs symlink state without rereading the script.
Co-Authored-By: Claude <noreply@anthropic.com>
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