[build-tools] Skip xcode-select and use local argent when EXPO_LOCAL

[gwdp]

Why

Local dev shortcut for argent remote sessions: skip the sudo xcode-select that hangs in non-interactive shells, and use the locally installed argent CLI instead of fetching via bunx.

How

When EXPO_LOCAL=1 and argent is on PATH, both the enable flag step and the server start launch use the local binary. xcode-select is skipped entirely in local dev.

Test plan

CI passes.

[codecov]

Codecov Report

❌ Patch coverage is 64.28571% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.18%. Comparing base (9247f3c) to head (d596ad4).

Files with missing lines	Patch %	Lines
...ls/src/steps/functions/startArgentRemoteSession.ts	64.29%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3923      +/-   ##
==========================================
+ Coverage   59.18%   59.18%   +0.01%     
==========================================
  Files         935      935              
  Lines       41075    41088      +13     
  Branches     8648     8654       +6     
==========================================
+ Hits        24306    24315       +9     
- Misses      16674    16678       +4     
  Partials       95       95              

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[github-actions]

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