Interpret all project descriptor values as strings

When the following declaration is made in `project.yaml`, the yaml parser interprets the value as a float:

```yaml
version: 0.1
```

Start by examining how the YAML parser handles the project.yaml declaration `version: 0.1`. Trace the project descriptor parsing entry point and its tests, then verify that descriptor values are treated as strings rather than numeric values, including the version example.

Written by the indexing model from the issue text.