migrate mosaic home to xdg config path

bin/mosaic-bootstrap-repo

@@ -27,12 +27,12 @@ if [[ ! -d "$TARGET_DIR" ]]; then
   exit 1
 fi
 
-MOSAIC_HOME="${MOSAIC_HOME:-$HOME/.mosaic}"
+MOSAIC_HOME="${MOSAIC_HOME:-$HOME/.config/mosaic}"
 TEMPLATE_ROOT="$MOSAIC_HOME/templates/repo"
 
 if [[ ! -d "$TEMPLATE_ROOT" ]]; then
   echo "[mosaic] Missing templates at $TEMPLATE_ROOT" >&2
-  echo "[mosaic] Install or refresh framework: ~/.mosaic/install.sh" >&2
+  echo "[mosaic] Install or refresh framework: ~/.config/mosaic/install.sh" >&2
   exit 1
 fi
 
@@ -74,7 +74,7 @@ if [[ ! -f "$TARGET_DIR/AGENTS.md" ]]; then
 
 ## Standards Load Order
 
-1. `~/.mosaic/STANDARDS.md`
+1. `~/.config/mosaic/STANDARDS.md`
 2. `AGENTS.md` (this file)
 3. `.mosaic/repo-hooks.sh`
 
@@ -88,8 +88,8 @@ bash scripts/agent/session-end.sh
 
 ## Shared Rails
 
-- Quality and orchestration guides: `~/.mosaic/guides/`
-- Shared automation rails: `~/.mosaic/rails/`
+- Quality and orchestration guides: `~/.config/mosaic/guides/`
+- Shared automation rails: `~/.config/mosaic/rails/`
 
 ## Repo-Specific Notes
 
@@ -103,8 +103,8 @@ fi
 
 echo "[mosaic] Repo bootstrap complete: $TARGET_DIR"
 echo "[mosaic] Next: edit $TARGET_DIR/.mosaic/repo-hooks.sh with project workflows"
-echo "[mosaic] Optional: apply quality rails via ~/.mosaic/bin/mosaic-quality-apply --template <template> --target $TARGET_DIR"
-echo "[mosaic] Optional: run orchestrator rail via ~/.mosaic/bin/mosaic-orchestrator-matrix-cycle"
+echo "[mosaic] Optional: apply quality rails via ~/.config/mosaic/bin/mosaic-quality-apply --template <template> --target $TARGET_DIR"
+echo "[mosaic] Optional: run orchestrator rail via ~/.config/mosaic/bin/mosaic-orchestrator-matrix-cycle"
 
 if [[ -n "$QUALITY_TEMPLATE" ]]; then
   if [[ -x "$MOSAIC_HOME/bin/mosaic-quality-apply" ]]; then