refactor: add retry runtime sdk seam

src/plugin-sdk/retry-runtime.ts

@@ -0,0 +1,15 @@
+// Public retry helpers for plugins that need retry config or policy runners.
+
+export {
+  resolveRetryConfig,
+  retryAsync,
+  type RetryConfig,
+  type RetryInfo,
+  type RetryOptions,
+} from "../infra/retry.js";
+export {
+  createRateLimitRetryRunner,
+  createTelegramRetryRunner,
+  TELEGRAM_RETRY_DEFAULTS,
+  type RetryRunner,
+} from "../infra/retry-policy.js";