feat(refactor): add simplification scan mode

I added a simplification mode for behavior-preserving clarity and size reduction: over-defensive guards, needless indirection, convoluted logic, redundant state, and legibility rewrites. It runs in the default full scan and on its own. For the lenses dead-code and duplication already own (identical-twin branches, plain deletion, repeated literals) it cross-references those modes instead of specifying detection twice. It's distinct from /simplify, which works the current diff. This sweeps existing code.

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