Item 1 of the fix-batch-3 brief: check whether CultNetSelection.Validate
refuses a cites.target.schemaId that CultNetSchemaAliasMatching cannot
resolve. It already does (CultNetSelection.cs:389-394), landed by an earlier
Hands pass on this branch (the "C# matrix Hands", after the parity table in
the spec was captured) - so no production code changed here.
What was still missing: SelectionParityVectorTests.RefusalCases() had a
comment explaining why refuses_unmatched_cites_target_schema stayed
"Rust-only", dated before that door check landed. The comment was stale and
the vector was never added. Added it, plus
refuses_cites_target_by_hash_shaped_alias (Self's ruling 2026-09-22: "the C#
reference's alias rule is the rule" - C# only resolves a name-form alias, so
a hash-shaped cites.target.schemaId is exactly the same unresolved-target
case and must refuse at the same field). RefusalCases() now takes the
fixture's schemas dictionary to reach schemas["leaf_a"].HashAlias.
Verified on Yggdrasil: dotnet test tests/GameCult.Networking.Tests -c Release
--filter FullyQualifiedName~SelectionParityVectorTests (the existing
cross-runtime reader against the committed rs-written.json still passes, so
this change does not depend on anything the Rust Hands owns). Regenerated
contracts/cultnet/interop/selection-vectors.cs-written.json with
CULTNET_WRITE_VECTORS=1: both new refusal vectors are present and both
refuse at "cites.target.schemaId" as expected before being committed as
vectors (WriteSelectionVectors's own Assert.Throws gate).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
b1932d95ed