bootstrap repo to mosaic standards layer

.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

.mosaic/repo-hooks.sh

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+#!/usr/bin/env bash
+# Optional repo-specific hooks used by scripts/agent/*.sh
+
+# Called by session-start.sh
+# mosaic_hook_session_start() {
+#   echo "Run repo-specific startup checks"
+# }
+
+# Called by critical.sh
+# mosaic_hook_critical() {
+#   echo "Run repo-specific critical queries"
+# }
+
+# Called by session-end.sh
+# mosaic_hook_session_end() {
+#   echo "Run repo-specific end-of-session checks"
+# }