feat(operational): add Operational package family for diagnostics and resilience - #61

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4.2.2. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Possible null reference argument for parameter 'value' in 'void AssertionUtility.IsNotNull(object value, string message)'.

Possible null reference argument for parameter 'value' in 'void AssertionUtility.IsNotNull(object value, string message)'.

Possible null reference argument for parameter 'value' in 'void AssertionUtility.IsNotNull(object value, Type type, string format, params object[] args)'.

Possible null reference argument for parameter 'value' in 'void AssertionUtility.IsNotNull(object value, string message)'.

Possible null reference argument for parameter 'value' in 'void AssertionUtility.IsNotNull(object value, string message)'.

Possible null reference argument for parameter 'value' in 'void AssertionUtility.IsNotNull(object value, string message)'.

Possible null reference argument for parameter 'value' in 'void AssertionUtility.IsNotNull(object value, string message)'.

Converting null literal or possible null value to non-nullable type.

Possible null reference argument for parameter 'item' in 'void List<T>.Add(T item)'.