C1 PASS, C3 PASS bit-perfect (same sha), C4 PASS bit-perfect (digit-
for-digit SSIM reproduction — decoder is deterministic), C5 PASS
within ±2% (Phase 3 σ was tight so the spread is small), C6 PASS
empty dmesg diff.
C2 ioctl counts came back ~2× Phase 3 — analyzed as a script bug
in p3_engage.sh's cleanup (rm -f $log.strace doesn't catch the
$log.strace.<tid> files, so Phase 7's grep aggregates both runs).
Real HW behavior unchanged; system regression NOT indicated. Filed
as a minor follow-up tweak, not iter1-blocking.
Phase 4 prediction matched observations. No loopback. iter1 ready
for Phase 8 close.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
