fix: Allow mixing subcommands with subcommand groups

[Jiralite]

Subcommands may be mixed with subcommand groups at the top level. This pull request allows this and adds a test for it.

Reported: https://canary.discord.com/channels/222078108977594368/937420598383108167/1442986459362627655

[vercel]

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2 Skipped Deployments

Project	Deployment	Preview	Comments	Updated (UTC)
discord-js	Skipped			Nov 25, 2025 9:43pm
discord-js-guide	Skipped			Nov 25, 2025 9:43pm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 44.99%. Comparing base (5dea946) to head (46f8f3c).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11303      +/-   ##
==========================================
+ Coverage   44.97%   44.99%   +0.01%     
==========================================
  Files         317      317              
  Lines       18222    18228       +6     
  Branches     1817     1817              
==========================================
+ Hits         8196     8202       +6     
  Misses      10013    10013              
  Partials       13       13              

Flag	Coverage Δ
builders	81.19% <100.00%> (+0.03%)	⬆️

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