Make use of static create methods

### What

In alive monitor, but also elsewhere, there are `init()`, `construct()`, and other similar method names to handle situations where construction can fail, but we want to handle the error. A cleaner pattern could be to use a static `Create()` method that returns a newly created object or error on failure

### Acceptance Criteria (DoD)

- `construct()` and `init()` methods are removed or made private

### How

_No response_

Search the repository for init() and construct(), starting with the alive monitor and other construction paths mentioned in the issue. Identify each affected class and its existing error-handling tests; the work is done when those methods are removed or private and the agreed static Create() pattern covers construction failures.

Written by the indexing model from the issue text.