Code Simplifier

The skill

Subtraction-first cleanup of code and tests. Deletes code that does not need to exist, collapses needless indirection, and prunes tests that protect nothing, while preserving the behavior people rely on and keeping the result fast and safe. Use after implementing or modifying code, when invoked as `$code-simplifier`, and whenever the user asks to simplify, clean up, slim down, de-bloat, reduce, remove dead code, cut over-engineering, or prune, trim or delete low-value, redundant or unnecessary tests, even if they only say a diff or PR is too big, has too much code, or has too many tests.

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