Validate Whirlpool rounds

[marko1olo]

Fixes #2508.

Whirlpool exposes Rounds as a numeric option with a UI range of 1-10, but the operation accepted direct API/recipe values outside that range. Passing a negative round count through to crypto-api produced the reported all-zero Whirlpool output.

This adds runtime validation for integer rounds in the supported 1-10 range, while preserving existing recipes that omit the second argument by defaulting to 10 rounds.

AI disclosure:

• This change was prepared with assistance from OpenAI Codex.

Validation:

• node --no-warnings --no-deprecation --openssl-legacy-provider tests/operations/index.mjs passed: 1962 passing.
• npx eslint src/core/operations/Whirlpool.mjs tests/operations/tests/Hash.mjs passed.
• npx grunt configTests passed.
• git diff --check passed.

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