fix: warn evaluate_script not to navigate page because navigation destroys execution context

[AhmerYarnham]

Fixes #1894

Changes

• Added warning in evaluate_script tool description that navigation
  (window.location.href) destroys execution context
• Updated CLI help text
• Updated tool-reference.md docs
• Added regression test coverage

How to test

Run: npm run test:no-build -- tests/tools/script.test.ts

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[Lightning00Blade]

Thanks for the PR, but the real issue here is testing the new error, because of that we would prefer the team handle issues labeled with evals.