fix: make mamba work in absence of tty

[sghng]

Description

Try to make Mamba work when TTY is not available, helpful for AI agent.

Type of Change

• Bugfix
• Feature / enhancement
• CI / Documentation
• Maintenance

Checklist

• My code follows the general style and conventions of the codebase, ensuring consistency
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have run pre-commit run --all locally in the source folder and confirmed that there are no linter errors.
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests pass locally with my changes

[codecov]

Codecov Report

❌ Patch coverage is 0% with 29 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.18%. Comparing base (d2adddc) to head (5ef3fa4).
⚠️ Report is 18 commits behind head on main.

Files with missing lines	Patch %	Lines
libmamba/src/core/run.cpp	0.00%	29 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4166      +/-   ##
==========================================
- Coverage   51.21%   51.18%   -0.04%     
==========================================
  Files         239      239              
  Lines       28669    28688      +19     
  Branches     3008     3010       +2     
==========================================
+ Hits        14682    14683       +1     
- Misses      13984    14002      +18     
  Partials        3        3              

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