feat: Phase 1 — config, auth, OAuth2 PKCE, CLI scaffold, token store

internal/auth/helpers.go

@@ -0,0 +1,19 @@
+package auth
+
+import (
+	"fmt"
+	"net/url"
+	"os"
+)
+
+func readFile(path string) ([]byte, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("read file: %w", err)
+	}
+	return data, nil
+}
+
+func parseURL(raw string) (*url.URL, error) {
+	return url.Parse(raw)
+}