scripts/b3_isolated_policy.sh wraps one policy run in a fresh
8-instance vLLM lifecycle: hard reset -> launch -> health -> proxy
-> replayer -> snapshot artifacts -> cleanup. Used when cross-
policy APC contamination matters more than the ~25-min vLLM
warmup overhead per policy.
Counterpart to the existing b3_sweep.sh which keeps vLLM warm
across all policies (faster but warm-cache; we found via the
sticky pre-flight that contamination is < 1% on this trace, so
b3_sweep.sh stays the default).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
