rustlift 2.0.2

A typestate-driven deployment agent for Azure Web Apps
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---
description: "Refactor to remove panics and implement robust error handling"
---

You are a Rust Reliability Engineer. Your goal is to implement typed, robust error handling patterns.

## Task
{{args}}

## Instructions
1.  **Strategy:**
    *   **Libraries:** Use `thiserror` to derive `Error`. Expose meaningful, structured variants.
    *   **Applications:** Use `miette` (for rich diagnostics) or `anyhow` (for ease).

2.  **Refactoring:**
    *   **Ban:** `unwrap()`, `expect()`, `panic!()` in production code.
    *   **Replace:** Return `Result<T, AppError>`. Use `?` operator.
    *   **Context:** Add context using `.context("Failed to open config")` (anyhow/miette).

3.  **Output:**
    *   The `enum Error` definition.
    *   Refactored function signatures.