chore: Add GEMINI.md and exceptions tests

[gigi81]

No description provided.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 45.45455% with 6 lines in your changes missing coverage. Please review.

Project coverage is 65.27%. Comparing base (a1f5297) to head (69e17fc).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...soft.Tools.DatabaseDeploy.Oracle/OracleDatabase.cs	0.00%	3 Missing ⚠️
....Tools.DatabaseDeploy.Oracle/OracleObjectsGraph.cs	0.00%	0 Missing and 2 partials ⚠️
...atabaseDeploy/Services/GenerateSchemaDdlService.cs	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #44      +/-   ##
==========================================
+ Coverage   62.85%   65.27%   +2.42%     
==========================================
  Files          59       59              
  Lines        1610     1610              
  Branches      165      165              
==========================================
+ Hits         1012     1051      +39     
+ Misses        545      506      -39     
  Partials       53       53              

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