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fix: capture-free blocks normalize to empty — .parg tree gate 289/289 - #788
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…9/289 The grammar consumes comments as whitespace, so a comment-only or empty parallel/sequence body matches zero rule lines and .as folds the capture-free block to a raw slice. The artifact's empty capture is an array; the Normalizer now folds raw block values the same way. Differential tree gate: 289/289 corpus maps byte-identical through the .parg artifact (un-mar included via the bare-\\U accommodation).
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The grammar consumes comments as whitespace, so a comment-only or empty
parallel {}/sequence {}body matches zero rule lines —.asfolds the capture-free block to a raw slice, while the .parg artifact's empty capture is an array. The Normalizer now folds raw block values to[]the same way.Differential tree gate: 289/289 corpus maps byte-identical through the portable .parg artifact — the last two stragglers closed: odni-kor's comment-only parallels, and un-mar (its converter-corrupted bare
\Uparses via the accommodation from #783). Full suite 1152/0, lint clean.With the gate fully green, artifact-parse can become the runtime path (the parser and its portable grammar are proven equivalent on the entire corpus).