Enable Tuist caching and build insights in CI

[Kyle-Ye]

Summary

• connect the root and Example manifests to the OpenAttributeGraph Tuist project
• update both Tuist pins to 4.203.0-rc.1
• authenticate Xcode CI jobs through GitHub OIDC and initialize the remote cache
• report SwiftPM builds, tests, and XCFramework archives through Tuist Build Insights
• migrate the Example to native local-package integration while retaining the root package resolution lock

Motivation

Reuse compilation outputs across CI runs and publish build timing and cache-effectiveness data to the Tuist dashboard.

[tuist]

🛠️ Tuist Run Report 🛠️

Tests 🧪

Scheme	Status	Cache hit rate	Tests	Skipped	Ran	Commit
OpenAttributeGraph-Package	✅	0 %	90	0	90	bd8bcb6bf

Builds 🔨

Scheme	Status	Duration	Commit
OpenAttributeGraph	✅	21.0s	bd8bcb6bf
OpenAttributeGraph-Package	✅	28.3s	bd8bcb6bf

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 32.17%. Comparing base (40226e3) to head (39f2473).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #230      +/-   ##
==========================================
+ Coverage   32.10%   32.17%   +0.07%     
==========================================
  Files          71       71              
  Lines        2601     2601              
==========================================
+ Hits          835      837       +2     
+ Misses       1766     1764       -2     

Flag	Coverage Δ
ios	32.19% <ø> (+0.07%)	⬆️
macos	10.15% <ø> (ø)
ubuntu	12.03% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.
see 1 file with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[augmentcode]

^{PR Risk Analyzer Agent🛡️}

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