fix(cli): accept readonly string array in parseArgs

[eser]

Summary

• Updates parseArgs() to accept readonly string[] in addition to string[]
• This allows passing readonly arrays (e.g., as const arrays or frozen arrays) without type errors
• Backwards compatible change - existing code continues to work

Motivation

Currently, passing a readonly array to parseArgs() causes a TypeScript error, even though the function doesn't mutate the input array. This change makes the API more flexible and aligns with the actual behavior of the function.

Test plan

• Existing tests pass (deno task ok)
• Manually verified that readonly arrays can now be passed to parseArgs()

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.16%. Comparing base (dcfb5b3) to head (c9543c0).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6911      +/-   ##
==========================================
+ Coverage   94.14%   94.16%   +0.01%     
==========================================
  Files         583      583              
  Lines       42806    42792      -14     
  Branches     6815     6815              
==========================================
- Hits        40301    40294       -7     
+ Misses       2455     2447       -8     
- Partials       50       51       +1     

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[kt3k]

LGTM