initial: design + plan for kg-setup skill

Port the design spec and 17-task implementation plan from arb-scanner
(where the idea was born) to this dedicated repo. Paths in the plan
adjusted to treat this repo root as the skill root (no skills/kg-setup/
subdirectory). Implementation follows via subagent-driven-development.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

README.md

@@ -0,0 +1,14 @@
+# kg-setup
+
+Claude Code skill that bootstraps a 4-layer project memory system
+(CodeGraph + GitNexus MCP servers + project CLAUDE.md section +
+Obsidian vault folder + auto-memory pointer) in any local project on macOS.
+
+**Status:** Design complete, implementation pending.
+
+- Design: [`docs/design.md`](docs/design.md)
+- Plan: [`docs/plan.md`](docs/plan.md)
+
+Implementation is executed via `superpowers:subagent-driven-development`
+against `docs/plan.md`. Task 1 of the plan replaces this README with the
+full user-facing version.