Refactor/color mode to be enumeration

[peczenyj]

Description

This PR introduce a new enumeration: Colorize, and fix some issues with mock generation

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that changes existing behavior)
• Documentation only
• Tooling / CI / chore

Checklist

• My commits follow Conventional Commits (so git-cliff can build the changelog).
• task ci passes locally (tidy check + lint + build + test + smoke).
• I added or updated tests for my change.
• I updated the documentation (README / godoc / AGENTS.md) where relevant.
• I kept the change compatible with the supported Go floor (1.25+).

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.80%. Comparing base (fa0b505) to head (0768f3e).

Additional details and impacted files

@@            Coverage Diff             @@
##            devel      #26      +/-   ##
==========================================
+ Coverage   84.78%   84.80%   +0.02%     
==========================================
  Files          10       10              
  Lines         677      678       +1     
==========================================
+ Hits          574      575       +1     
  Misses         65       65              
  Partials       38       38              

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