feat: more chroma_service tests

[bossjones]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 52.59259% with 64 lines in your changes missing coverage. Please review.

Project coverage is 38.61%. Comparing base (bf324c0) to head (63b26ac).
Report is 12 commits behind head on main.

Files	Patch %	Lines
src/goob_ai/services/chroma_service.py	50.00%	25 Missing ⚠️
src/goob_ai/utils/imgops.py	20.00%	24 Missing ⚠️
src/goob_ai/agent.py	78.37%	8 Missing ⚠️
src/goob_ai/cli.py	45.45%	5 Missing and 1 partial ⚠️
src/goob_ai/tools/rag_tool.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
+ Coverage   38.08%   38.61%   +0.52%     
==========================================
  Files          63       63              
  Lines        6128     6231     +103     
  Branches      805      816      +11     
==========================================
+ Hits         2334     2406      +72     
- Misses       3688     3716      +28     
- Partials      106      109       +3     

Flag	Coverage Δ
3.10	38.61% <52.59%> (+0.52%)	⬆️
Linux	38.61% <52.59%> (+0.52%)	⬆️
X64	38.61% <52.59%> (+0.52%)	⬆️

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