chore(ci): bootstrap CI + hooks

Squash-merge bootstrap-cicd into integration

scripts/setup-hooks

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+root_dir="$(git rev-parse --show-toplevel 2>/dev/null || pwd)"
+
+mkdir -p "$root_dir/.git/hooks"
+
+for hook in pre-commit pre-push commit-msg; do
+  src="$root_dir/.githooks/$hook"
+  dest="$root_dir/.git/hooks/$hook"
+  if [[ -f "$src" ]]; then
+    cp "$src" "$dest"
+    chmod +x "$dest"
+    echo "Installed hook: $hook"
+  fi
+done
+
+echo "Git hooks installed."
+