dead-code

Find and safely remove dead code: unreachable paths, unused exports, unused functions, unused variables, unused CSS selectors, unused npm/pip/cargo dependencies, unused env vars, and commented-out code blocks. Builds full import graph, verifies no dynamic references before removal, runs build and tests after cleanup. Use when trimming bloat, removing unused dependencies, cleaning up after a refactor, reducing bundle size, or eliminating stale code.