Superpowers is cloned from git, so skills live under
.cursor/skills/superpowers/skills/<name>/SKILL.md, not
.cursor/skills/superpowers/<name>/SKILL.md.
The Cursor Agent CLI now discovers skills from .cursor/skills/ instead
of the old .cursor/rules/ directory. Update all references across
create-plan and implement-plan Cursor variants and docs.
New skill that executes create-plan artifacts in an isolated git worktree
with iterative cross-model milestone review. Supports codex, claude-code,
opencode, and cursor agent variants.
