Add Linux compilation support

[davidbean-hash]

Change Description:

Adds Linux compilation support by replacing macOS-only UTTypeConformsTo (from CoreServices) with a cross-platform utiConforms() helper function. Fixes ChargePoint/xcparse#77.

The main blocker for Linux builds was UTTypeConformsTo from CoreServices, which is macOS-only. This PR:

1. Creates Sources/XCParseCore/UTICompat.swift — a cross-platform UTI conformance check:

   • On macOS: delegates to UTTypeConformsTo via #if canImport(CoreServices)
   • On Linux: uses a fallback UTI hierarchy with transitive conformance checking

2. Replaces all UTTypeConformsTo calls in ScreenshotsCommand.swift, AttachmentsCommand.swift, and CommandRegistry.swift

3. Removes macOS platform restriction from Package.swift to allow Linux builds

4. Fixes Linux compilation errors:

   • Added import XCParseCore to AttachmentsCommand, CommandRegistry, ScreenshotsCommand (utiConforms was not in scope)
   • Added import FoundationNetworking for URLSession/URLRequest on Linux
   • Fixed ProcessInfo() → ProcessInfo.processInfo (internal init on Linux)
   • Removed unused Bundle(for:) call in ReportConverterTests

5. Expanded UTI hierarchy to cover all common types:

   • Images: heic, heif, png, jpeg, gif, tiff, bmp, svg, icns
   • Text: plain-text (utf8/utf16), html, json, xml
   • Data: public.data as root for image, text, json, xml

6. Added comprehensive UTI tests (UTICompatTests.swift) with 11 test cases covering identity, image conformance, text hierarchies, transitive conformance (e.g. public.png → public.data), and negative cases

7. Fixed Linux test discovery — registered ScreenshotCommandUTITests and UTICompatTests in XCTestManifests.swift

Reference: Based on endanke's WIP commit.

Test Plan/Testing Performed:

• ✅ swift build succeeds on Linux (Ubuntu 22.04, Swift 5.10.1)
• ✅ swift test --filter UTICompatTests — 11/11 tests pass
• ✅ swift test --filter ScreenshotCommandUTITests — 1/1 test passes
• ✅ Verified UTI hierarchy covers all required types: heic, heif, png, jpeg, gif, tiff, bmp (images); plain-text, json, xml (text); public.data (data)
• ✅ Transitive conformance verified (e.g. public.png conforms to public.data via public.image)
• ✅ Non-image UTIs correctly reject public.image conformance

Link to Devin session: https://app.devin.ai/sessions/668559778fc94cc8a60cb94da5222224
Requested by: @davidbean-hash

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 4 additional findings.

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🧪 Linux E2E Test Results

Environment: Ubuntu 22.04.5 LTS, Swift 5.10.1, x86_64-unknown-linux-gnu
Session: https://app.devin.ai/sessions/668559778fc94cc8a60cb94da5222224

Build & Test Results

Test	Result	Details
swift build on Linux	PASSED	Build complete in 5.47s, exit code 0
UTICompatTests (11 tests)	PASSED	Identity, image, text, data hierarchies, transitive conformance, negatives
ScreenshotCommandUTITests (1 test)	PASSED	Image UTI filter works correctly
Full suite (xcresulttool tests)	EXPECTED FAIL	20 tests fail because xcresulttool is macOS-only — pre-existing, not related to this PR

Code Changes Verified

• UTICompat.swift: #if canImport(CoreServices) guard with macOS + Linux paths confirmed
• UTI hierarchy covers: heic, heif, png, jpeg, gif, tiff, bmp, svg, icns (images); plain-text, json, xml (text); public.data
• import XCParseCore added to AttachmentsCommand, CommandRegistry, ScreenshotsCommand
• import FoundationNetworking guard in XCPParser.swift for URLSession on Linux
• ProcessInfo.processInfo fix in xcparseTests.swift
• Removed unused Bundle(for:) in ReportConverterTests.swift
• Linux test discovery: ScreenshotCommandUTITests + UTICompatTests registered in XCTestManifests.swift

UTICompatTests — Full Output

Test Suite "UTICompatTests" started
  testIdentityConformance           — passed
  testImageConformance              — passed
  testNonImageDoesNotConformToImage — passed
  testPlainTextConformance          — passed
  testTextSubtypes                  — passed
  testTransitivePlainTextToText     — passed
  testDataConformance               — passed
  testTransitiveImageToData         — passed
  testTransitiveTextToData          — passed
  testUnknownUTI                    — passed
  testReverseConformanceDoesNotHold — passed
Executed 11 tests, with 0 failures (0 unexpected) in 0.004s