v0.323.0

changelog: post-jit-2 cycle close

Seven-release sub-cycle (v0.317-v0.323) wrapping. Side-exit
deopt stencil landed cleanly: real-workload corpora now show
100% reason=OK eligibility; the full test corpus contributes
one OK_WITH_DEOPT and zero hard rejections. JIT loop
cancellability closes the v0.312 audit gap. Control-flow
stencil work measurement-gated and shipped zero new stencils
honestly per the 7% movement threshold.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>