[recursion-v2] adjust base layer transcript observing order#1292

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hero78119 wants to merge 3 commits intomasterfrom

Commits on Apr 1, 2026

misc: observe order
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Commits on Apr 3, 2026

observed num_instance within per-chip fork
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Commits on Apr 4, 2026

remove fork and replace with observing challenge from parent transcript
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