Promise waterfall flow

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### 💡 How to Think About This Problem
When implementing **Promise waterfall flow** in a frontend interview, candidate developers should focus on structural correctness, managing execution bindings, and minimizing performance overhead.

#### 1. Deconstructing the Requirements
To build a robust solution for **Promise waterfall flow**:
* **Inputs/Outputs**: Validate parameter types, handling boundary values such as empty values, null properties, or negative constraints cleanly.
* **Design Philosophy**: Break the problem down into small, composable operations that are easy to test.

#### 2. Step-by-Step Walkthrough

* **Step-by-Step Walkthrough**:
  * **Step 1: Reducer pipeline sequence** - Chain values sequentially using standard `reduce`.
  * **Step 2: Intermediate value mapping** - Pipe results of previous resolve outputs into current task callbacks.
  * **Step 3: Context parameters checks** - Validate callback shapes supporting mixed synchronous and asynchronous functions.

#### 3. Co

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