fixture-solo-skill

Placeholder skill content for eval-harness tests. Deliberately a synthetic
name that no real registry ships, so this fixture can never be confused with —
or accidentally shadow — a skill in the adam-agentskills repo.

The plugin dir and the skill dir share this name on purpose: that is exactly
the legacy layout (plugins/<skill>/skills/<skill>/SKILL.md) this fixture
exists to keep resolvable.