ProviderInstanceRegistryLive, AntigravityAdapter, and
SourceControlRepositoryService asserted literal posix paths against values
the code under test had run through Path.resolve or Path.join, so on Windows
the received side carried a drive letter and backslashes. Resolve the
expectation with the same Path. cli/config tolerates the bootstrap fd
already being closed where the reader has no /proc path and consumes the fd
itself, and WorkspaceFileSystem skips its FIFO case on Windows.

Co-Authored-By: Claude Code <noreply@anthropic.com>