cs: the 1:1 piece↔item gate lands before lever F (#212) - #229
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The flat codec re-derives #198-safety from every classifier returning one piece per item or false; nothing asserted it and the package had no tests. TestFlatFallbackReEmitsItemsNotPieces now pins the output properties the invariant protects: a fixed array emits exactly one element loop per direction, a single-scalar fallback (the one fallback path that runs today) emits exactly one per-field serialize per direction, and a nested struct at the run cap never names inner fields on the outer base. Sabotage control: doubling the fallback's item emission goes red (3 serializes detected); restored, green. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Closes #212 (the #208 review's first ask).
internal/codegen/csharpgets its first test file: the C# twin of Go'sTestFlatFallbackReEmitsItemsNotPieces, pinning the three output properties the 1:1 invariant protects — element-loop count on a fixed array, per-field serialize count through the live fallback path (flatWorthwhilerefusing a run of one), and no inner-field-on-outer-base at the 384-bit run cap. Proven discriminating by sabotage (doubling the fallback's item emission → red), green as landed. Lever F cannot make classification 1:N without answering to it.🤖 Generated with Claude Code