Add mirror source structure for verified files#1800
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Nests `.verified.` files in sub-directories that mirror the directory structure of the test source files relative to the project directory, so a test in Foo/FooTests.cs writes to Snapshots/Foo instead of a flat Snapshots folder. This makes orphaned snapshots easier to identify when test source files are moved, renamed, or removed. Behavior is unchanged when the option is not set. The derivation is shared via the public PathInfo.DeriveProjectRelative so all six adapters use one implementation. It cannot live on core Extensions/IoHelpers: each adapter has a local Extensions.cs that shadows the core type, and Verify.Fixie is unsigned so it has no InternalsVisibleTo access to core internals. Resolves #1758
Adding an optional parameter changed the method signature, so assemblies compiled against the single argument overload would fail at runtime with a MissingMethodException. Restore the single argument overload and mark it obsolete, and apply OverloadResolutionPriority to the mirrorSourceStructure overload so source callers bind to it rather than to the obsolete one. The obsolete overload remains only to keep existing binaries working. Polyfill supplies OverloadResolutionPriorityAttribute for the target frameworks whose BCL lacks it.
This was referenced Jul 17, 2026
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fixes #1758