feat: enable Basic var and List var to coexist for the local search

[zepfred]

This PR completes the feature and enables the mixed model for local search.

[zepfred]

@triceo I plan to add documentation about the mixed model once I finish the quick-start change, as I'll have concrete models to use in the explanation.

[triceo]

This continues to be suspiciously simple. I am really surprised.

Did you test what happens when strength/difficulty comparisons are used? Did you check entity/value sorter manner? We do not support some of it with list variables, and we need to make sure that this does not change here; and the use cases which work still need to work in the mixed mode.

[zepfred]

This continues to be suspiciously simple. I am really surprised.

Did you test what happens when strength/difficulty comparisons are used? Did you check entity/value sorter manner? We do not support some of it with list variables, and we need to make sure that this does not change here; and the use cases which work still need to work in the mixed mode.

If there is coverage for the mentioned features, then we know the default behavior remains unchanged. I'll ensure to add tests for the relevant features.

[triceo]

LGTM after comments resolved.

[sonarqubecloud]

Quality Gate passed

Issues
6 New issues
0 Accepted issues

Measures
0 Security Hotspots
88.5% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud