Use Tasks rather than runners for execution specialization

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.85%. Comparing base (fe11f9e) to head (f19898f).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## version_4_trunk #89 +/- ## =================================================== - Coverage 94.86% 94.85% -0.01% =================================================== Files 31 31 Lines 1577 1575 -2 =================================================== - Hits 1496 1494 -2 Misses 81 81 ```

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[gregbell26]

This is a good starting point for #84