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Define sentinel error types (ErrNotRunning, ErrRateLimit, ErrTemporary, ErrSendFailed) so the Manager can classify Send failures and choose the right retry strategy: permanent errors bail immediately, rate-limit errors use a fixed 1s delay, and temporary/unknown errors use exponential backoff (500ms→1s→2s, capped at 8s, up to 3 retries). A per-channel token-bucket rate limiter (golang.org/x/time/rate) throttles outbound sends before they hit the platform API.