A shadow block of S ALU instructions run R times at the end of every iteration, drawn from the program stream after
the 64 base instructions, behind LoadClass::shadow: v2 and v3 draw nothing and emit nothing (the pinned packs are
byte-identical, cargo test 54 + 4 + 19 + 7 green). The interpreter, the three kernel dialects (both kernels each),
program.h and program.json carry it; the acceptance rule interprets the base program only. Packs for seed
igneum-genesis over class mx8 at 4,096 to 180,224 shadow instructions per hash (proto-cuda/packs-ca3-shadow), and
the PC 2 bench playbook tools/ca3-shadow/pc2-shadow-bench.ps1 (passes the publisher's three checks).
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
