Add Haskell implementation of randstr#5

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copilot/add-haskell-implementation

Commits on Mar 7, 2026

Address PR review: guard configRandom, validate CLI args, fix empty char class, secure mode error, fix NormalRange clamping

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Commits on Mar 9, 2026

Address review round 2: strengthen test assertions, fix env var consistency, remove redundant import

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