ci: add early arm64 builds and SwiftLint checks (#2)

scripts/check-local.sh

@@ -0,0 +1,55 @@
+#!/bin/bash
+set -euo pipefail
+
+usage() {
+    echo "Usage: scripts/check-local.sh /absolute/path/to/validation-directory [primary|macos15]"
+}
+
+if [[ "${1:-}" == --help || "${1:-}" == -h ]]; then
+    usage
+    exit 0
+fi
+if [[ $# -lt 1 || $# -gt 2 ]]; then
+    usage >&2
+    exit 2
+fi
+
+validation_root="$1"
+profile="${2:-primary}"
+case "$validation_root" in
+    /*) ;;
+    *) echo "The validation directory must be an absolute path." >&2; exit 2 ;;
+esac
+case "$profile" in
+    primary) toolchain=(27.1 27A9275 27.0 27) ;;
+    macos15) toolchain=(26.3 17C529 26.2 15) ;;
+    *) echo "Profile must be primary or macos15." >&2; exit 2 ;;
+esac
+
+repo_root="$(cd "$(dirname "$0")/.." && pwd)"
+cd "$repo_root"
+trap 'status=$?; echo "Local checks failed (exit $status)." >&2; exit "$status"' ERR
+
+echo "Checking toolchain ($profile)..."
+scripts/verify-toolchain.sh "${toolchain[@]}"
+
+echo "Checking shell syntax and Git whitespace..."
+for script in scripts/*.sh; do
+    bash -n "$script"
+done
+git diff --check
+git diff --cached --check
+
+echo "Running SwiftLint..."
+scripts/lint.sh "$validation_root/tools"
+
+for configuration in Debug Release; do
+    echo "Building $configuration..."
+    scripts/build.sh "$validation_root/build" "$configuration"
+done
+
+echo "Checking application binaries and signatures..."
+scripts/verify-build.sh "$validation_root/build"
+
+echo "Local checks passed ($profile): lint, Debug, Release, arm64, macOS 15.0 minimum and signatures."
+echo "Hosted workflow execution and manual application checks remain separate."