feat: improve testing infrastructure and CI workflow

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches:
+      - main
+      - master
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 9
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: 'pnpm'
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Run tests with coverage
+        run: pnpm test -- --watch=false --coverage
+        env:
+          CI: true
+
+      - name: Upload coverage report
+        uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: coverage-report
+          path: coverage/
+          retention-days: 30

Makefile

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+.PHONY: test test-watch test-coverage test-file lint lint-fix help
+
+# Run all tests once (CI mode)
+test:
+	CI=1 npm test -- --watch=false
+
+# Run tests in watch mode (interactive development)
+test-watch:
+	npm test
+
+# Run tests with coverage report
+test-coverage:
+	CI=1 npm test -- --coverage --watch=false
+
+# Run a specific test file
+# Usage: make test-file FILE=src/utils/__tests__/retry-with-fallback.test.js
+test-file:
+	@if [ -z "$(FILE)" ]; then \
+		echo "Error: FILE parameter is required"; \
+		echo "Usage: make test-file FILE=src/utils/__tests__/retry-with-fallback.test.js"; \
+		exit 1; \
+	fi
+	CI=1 npm test -- --watch=false --testPathPattern="$(FILE)"
+
+# Run ESLint
+lint:
+	npm run lint
+
+# Auto-fix ESLint issues
+lint-fix:
+	npm run lint:fix
+
+# Show available commands
+help:
+	@echo "Available make commands:"
+	@echo "  make test             - Run all tests once (CI mode)"
+	@echo "  make test-watch       - Run tests in watch mode (interactive)"
+	@echo "  make test-coverage    - Run tests with coverage report"
+	@echo "  make test-file FILE=<path> - Run specific test file"
+	@echo "  make lint             - Run ESLint"
+	@echo "  make lint-fix         - Auto-fix ESLint issues"
+	@echo "  make help             - Show this help message"