fix: use code block fence around project structure tree

[jeffmm]

• adds code block fence marked as bash around the directory tree

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 86.36364% with 3 lines in your changes missing coverage. Please review.

Project coverage is 93.10%. Comparing base (7e3fb37) to head (e5c7bcc).
Report is 1 commits behind head on dev.

Files with missing lines	Patch %	Lines
src/project_context/utils.py	85.00%	3 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev       #2      +/-   ##
==========================================
- Coverage   93.52%   93.10%   -0.43%     
==========================================
  Files           4        4              
  Lines         170      174       +4     
==========================================
+ Hits          159      162       +3     
- Misses         11       12       +1     

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