Do Not Fully Initialize Assay if Not In Workspace

[chrstinalin]

Closes #124

Changes

• Avoids the complications with single files altogether by not allowing Assay to be used without a workspace.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.51%. Comparing base (e417670) to head (26a6f94).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #134      +/-   ##
==========================================
+ Coverage   91.41%   91.51%   +0.09%     
==========================================
  Files          28       28              
  Lines        2841     2839       -2     
  Branches      177      177              
==========================================
+ Hits         2597     2598       +1     
+ Misses        242      239       -3     
  Partials        2        2              

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