M11 Ecosystem

This handles Rust dependency and ecosystem questions, from picking the right crate to debugging integration errors like E0433 and E0603. It includes opinionated tables for common needs (serde for serialization, tokio for async, clap for CLI) and covers FFI scenarios with bindgen, PyO3, and wasm-bindgen. The skill auto-injects your current Cargo.toml dependencies for context and pushes you to think about maintenance status and feature flags before adding dependencies. Most useful when you're weighing framework choices or troubleshooting cross-language integration. The anti-patterns section calling out extern crate and wildcard versions is a nice touch that saves you from cargo hell.