chore: Reorganize repo

[redaranj]

Changes in this pull request

This PR brings the iOS repo structurally in-line with the c2pa-android repo. We rely on Xcode wherever possible and turn the Makefile into a wrapper around Xcode build commands as we did with Gradle/Android Studio in the other repo.

Tests are moved out of the Example app into a shared test scheme and the Example app now demos real functionality.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• All applicable changes have been documented
• Any TO DO items (or similar) have been entered as GitHub issues and the link to that issue has been included in a comment

[codecov]

Codecov Report

❌ Patch coverage is 65.17277% with 1018 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.05%. Comparing base (dd33b8c) to head (21971bd).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
TestShared/Sources/HardwareSigningTests.swift	12.23%	337 Missing ⚠️
TestShared/Sources/ReaderTests.swift	67.76%	98 Missing ⚠️
TestShared/Sources/ComprehensiveTests.swift	77.44%	97 Missing ⚠️
Library/Sources/SecureEnclaveSigner.swift	0.00%	90 Missing ⚠️
TestShared/Sources/StreamTests.swift	74.89%	58 Missing ⚠️
Library/Sources/KeychainSigner.swift	0.00%	54 Missing ⚠️
Library/Sources/WebServiceSigner.swift	75.53%	46 Missing ⚠️
TestShared/Sources/TestUtilities.swift	43.20%	46 Missing ⚠️
TestShared/Sources/SigningTests.swift	84.75%	41 Missing ⚠️
Library/Sources/Signer.swift	59.37%	39 Missing ⚠️
... and 7 more

❗ There is a different number of reports uploaded between BASE (dd33b8c) and HEAD (21971bd). Click for more details.

HEAD has 4 uploads less than BASE

Flag	BASE (dd33b8c)	HEAD (21971bd)
	4	0

Additional details and impacted files

@@             Coverage Diff              @@
##              main      #15       +/-   ##
============================================
- Coverage   100.00%   59.05%   -40.95%     
============================================
  Files            1       20       +19     
  Lines          104     3226     +3122     
============================================
+ Hits           104     1905     +1801     
- Misses           0     1321     +1321     

Flag	Coverage Δ
unittests	59.05% <65.17%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

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

[scouten-adobe]

Is it OK that this URL is public?

[redaranj]

@scouten-adobe Good catch. It's gone now.

[scouten-adobe]

Withdrawing this PR. I don't see meaningful perf gains in any of these variations.

So sorry, that comment was intended for a completely different window.