Add getDescription() to all commands

[dereuromark]

Summary

• Add static getDescription() method to AddCommand, InfoCommand, JobCommand, RunCommand, and WorkerCommand
• This ensures commands display descriptions in bin/cake command listing

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.39%. Comparing base (b74d00b) to head (514ee88).
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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #455      +/-   ##
============================================
+ Coverage     73.29%   73.39%   +0.09%     
- Complexity      778      783       +5     
============================================
  Files            41       41              
  Lines          2692     2702      +10     
============================================
+ Hits           1973     1983      +10     
  Misses          719      719              

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