Fix build issues by making Compression module conditional for cross-platform compatibility

[Copilot]

The repository was failing to build on non-Apple platforms (Linux) due to unconditional imports of the Compression module, which is only available on macOS and iOS.

Problem

The build was failing with errors like:

error: no such module 'Compression'

This occurred because:

• STComparator.swift imported Compression unconditionally
• The DownloadableFile.swift used compression functionality without platform checks
• Compression tests ran on all platforms regardless of availability

Solution

Applied minimal surgical changes following the existing conditional compilation patterns in the codebase:

1. Made STComparator conditional: Wrapped the entire STComparator.swift file in #if canImport(Compression) to only compile on platforms where compression is available.

2. Made compression API conditional: Updated DownloadableFile.swift to only expose the compression() method when the Compression module is available.

3. Made tests conditional: Updated compression tests to only run on platforms that support compression.

Benefits

• ✅ Builds successfully on Linux and other non-Apple platforms
• ✅ Preserves full compression functionality on Apple platforms
• ✅ No breaking changes to existing API
• ✅ Follows established patterns in the codebase
• ✅ Minimal code changes with maximum compatibility

The compression functionality remains fully available on macOS and iOS where it's supported, while allowing the library to build and function on other platforms without compression features.

Fixes #1.

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