feat: initial mosaic bootstrap framework

templates/repo/.mosaic/README.md

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+# 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