m06-error-handling

Rust error handling strategy: when to use Result, Option, panic, and which error crate. Layer 1: Language Mechanics Is this failure expected or a bug? Before choosing error handling strategy: Before handling an error: What kind of failure is this? Who handles this? What context is needed? When error strategy is unclear: From design to implementation: - Distinguishes between expected failures (Result/Option), bugs (panic), and unrecoverable errors; includes decision flowchart and core questions to ask before choosing a strategy - Recommends thiserror for typed library errors and anyhow for ergonomic application-level error handling; covers error propagation with ? and context attachment - Provides quick reference for unwrap vs expect vs panic, library vs application patterns, and common anti-patterns like silent error ignoring or over-use of unwrap - Can this fail in normal operation? - Who should handle this failure? - What context does the caller need?