run_headless.py is the Path B engine the nightly sweep calls: the 6 fresh-context
detectors + proof-or-kill verifier from /sh-security-review, run unattended via the
Claude Agent SDK on subscription OAuth (pops ANTHROPIC_API_KEY so the API key can't
silently win). Read-only tools, hermetic, per-call + total budget caps, fails toward
over-reporting. Emits the finding schema that review.sh --agent-findings consumes.
