chore: release v11.0.19

[avoidwork]

Release v11.0.19

Bump: patch (1 fix commit analyzed)
From: 11.0.18

Changes

• fix: resolve audit findings — padding truncation, isNaN clarity, structuredClone (fix: resolve audit findings — padding truncation, isNaN clarity, structuredClone #300)
• docs: add issue templates, security policy, and update contributing guide (feat: add issue templates, security policy, and update contributing guide #299)

What's included

• Padding truncation fix in applyNumberFormatting when separator and pad are both set
• isNaN(arg) → isNaN(num) clarity improvement
• structuredClone with JSON fallback in partial function
• Updated CHANGELOG.md
• Updated build artifacts