Deadcode Removal Layer for My Compiler in Less Than 140 LOC

This is a concise dead-code-elimination pass implemented as ~140 LOC of readable Rust: it walks op dependencies via a match over Op variants, collects reachable OpRefs, and prunes the op pool. It’s not reinventing compiler theory, but the implementation is tidy and immediately pluggable into a small IR/dataflow project — useful as a reference or drop-in optimizer. Lacking benchmarks, docs on integration, or tests, it’s more of a pragmatic utility than a research contribution.