fix output bug where only first outputs used

[ggmarshall]

also modified cli to take multiple configs and apply in cascade

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.52%. Comparing base (881bb0d) to head (4f5f739).
⚠️ Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
src/dspeed/cli.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #167      +/-   ##
==========================================
- Coverage   62.54%   62.52%   -0.03%     
==========================================
  Files          58       58              
  Lines        3917     3920       +3     
==========================================
+ Hits         2450     2451       +1     
- Misses       1467     1469       +2     

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