fix: switch file mode option to executable

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes 🐛 Bug: File system can only store executable?: boolean, not mode?: number (Git is lossy) #133
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

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Name	Status	Preview	Comments	Updated (UTC)
create	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 15, 2025 3:58pm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.52%. Comparing base (f7f1dac) to head (df00504).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #134      +/-   ##
==========================================
+ Coverage   98.51%   98.52%   +0.01%     
==========================================
  Files         179      182       +3     
  Lines        6520     6589      +69     
  Branches      961      971      +10     
==========================================
+ Hits         6423     6492      +69     
  Misses         94       94              
  Partials        3        3              

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