The same live mutant Soul found in Rust (dropping to.schemaId/to.recordKey
from the edge comparator) survives in C# too - both runtimes share the
comparator's shape, not a rule proving it. Land the C# mirror of Soul's
self-citing-peer counterexample from the rig, renamed so the self edge's
push order and the correct sort order actually disagree (the rig's own
"hub"/"other" naming left the drop-both mutation surviving by coincidence
of push order matching alphabetical order - see the Rust commit on this
branch for the construction).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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