bootstrap repo to mosaic standards layer

.mosaic/README.md

@@ -0,0 +1,15 @@
+# Repo Mosaic Linkage
+
+This repository is attached to the machine-wide Mosaic framework.
+
+## Load Order for Agents
+
+1. `~/.mosaic/STANDARDS.md`
+2. `AGENTS.md` (this repository)
+3. `.mosaic/repo-hooks.sh` (repo-specific automation hooks)
+
+## Purpose
+
+- Keep universal standards in `~/.mosaic`
+- Keep repo-specific behavior in this repo
+- Avoid copying large runtime configs into each project