fix: Add anyhow macro to imports in compression_engine.rs

Co-authored-by: aider (openai/andrew/openrouter/sonoma-sky-alpha) <aider@aider.chat>

src/compression_engine.rs

@@ -1,4 +1,4 @@
-use anyhow::Result;
+use anyhow::{Result, anyhow};
 use std::io;
 use std::io::{Read, Write};
 use std::path::PathBuf;