[SunSi12138]

Summary

• retain non-refundable receive-credit accounting and the related correctness coverage
• keep Brotli as the sole built-in compression provider; use the platform Brotli decoder's consumption reporting to reject trailing compressed data, removing the custom gzip/DEFLATE boundary parser
• negotiate providers through WireProfile; encode decode-relevant provider settings in that profile, with other compression algorithms supplied by custom providers
• keep the compression-provider contract synchronous and preserve exact consumed/written-byte reporting
• update documentation, benchmark scripts, package smoke coverage, and integration tests for the Brotli-only built-in surface

Validation

• dotnet build SharpLink.slnx --configuration Release --no-incremental --verbosity minimal (0 warnings, 0 errors)
• dotnet test --solution SharpLink.slnx --configuration Release --no-build --verbosity minimal (454 passed)
• Release pack plus local package-smoke test
• NativeAOT shared-memory independent-process smoke test (osx-arm64)

API note

ISharpLinkCompressionProvider.Algorithm is now WireProfile; built-in gzip and deflate factory methods are removed. Applications that need other formats can negotiate a custom provider by supplying its wire-profile token.

Closes #7