chore: import upstream snapshot with attribution

tools/ui/scripts/git-hooks/pre-commit.sh

@@ -0,0 +1,57 @@
+#!/usr/bin/env bash
+#
+# Pre-commit hook for llama-ui
+# Runs: format (staged files only) + type-check
+# Stashes unstaged changes temporarily and restores them after.
+
+# Only run when there are staged changes in tools/ui/
+if ! git diff --cached --name-only | grep -q "^tools/ui/"; then
+    exit 0
+fi
+
+REPO_ROOT=$(git rev-parse --show-toplevel)
+cd "$REPO_ROOT/tools/ui"
+
+# Check that node_modules exists
+if [ ! -d "node_modules" ]; then
+    echo "❌ node_modules not found. Run 'npm install' first."
+    exit 1
+fi
+
+# Stash unstaged changes in tools/ui/ so they don't interfere
+stash_name="pi-ui-precommit"
+git stash push --keep-index -u -m "$stash_name" -- tools/ui/ 2>/dev/null || true
+
+echo "Running pre-commit checks for llama-ui..."
+
+# Format only staged files
+staged_ui=$(git diff --cached --name-only -- tools/ui/)
+if [ -n "$staged_ui" ]; then
+    echo "$staged_ui" | xargs npm run format
+    format_ok=$?
+    # Re-stage formatted files
+    git add tools/ui/
+else
+    format_ok=0
+fi
+
+# Type-check the clean tree
+npm run check
+check_ok=$?
+
+# Restore stashed changes
+if git stash list | grep -q "$stash_name"; then
+    git stash pop 2>/dev/null || true
+fi
+
+if [ $format_ok -ne 0 ]; then
+    echo "❌ Format failed"
+    exit 1
+fi
+if [ $check_ok -ne 0 ]; then
+    echo "❌ Type check failed"
+    exit 1
+fi
+
+echo "✅ Pre-commit checks passed"
+exit 0