Multi-step gate flow completed at superhuman inter-step cadence (session-intent, not a single step)
bh.session_flow_superhuman · convicts
What it catches
Session-intent coherence — the SESSION-SHAPE axis, the multi-step generalization of the single-step timing tells (bh.arena_captcha_superhuman / bh.arena_queue_superhuman are per-gate; this is per-FLOW). The detector keeps a per-ks_sid FLOW LOG: the ordered gate-completion timestamps across a session's arena gates (captcha/slider/rotate verify + queue act, joined on the ks_sid cookie the relay already carries) — the multi-step substrate the arena never tracked (each gate was independent). A human completing a MULTI-GATE flow needs perceive+decide+solve+submit time PER step (seconds each); a bot chains gate completions in milliseconds. When the MEDIAN inter-step gap across >= _FLOW_MIN_STEPS (3) steps is below _FLOW_STEP_FLOOR_MS (500ms — a conservative physiological floor far under any real human's per-gate time), the detector injects behavioral.session_flow_superhuman. FP-SAFE BY CONSTRUCTION: a LOWER bound on the MEDIAN gap (robust to a single slow/idle/resumed step), set well under real human per-gate times (seconds) — so NO plausible human session shape (fast/slow/bursty/exploring/focused) trips it; only a machine chaining gates faster than a human can perceive them. This is the session-intent frontier's first tell: the blue side is bound by precision 1.0 and human session timing is diverse, so a convicting session-shape tell must key on the physiological floor no human crosses, not on 'looks fast'. Convicting (w0.85). GROUNDED LIVE 2026-07-04: the browserless arena-solver completes its multi-gate run at ms/step (median inter-step << 500ms) -> convicts; a humanized session (seconds of think-time between gates) and a synthesized diverse-human population (fast/slow/bursty inter-step distributions) are ALL silent. See docs/research-radar.md (session-intent axis).
Signals it reads
behavioral.session_flow_superhuman
How it fires
present
Bypassed by 10
Frontier evaders that reach the detector uncaught (scored only suspicious, defeating every convicting tell) — this check is not one that stops them. The red-team frontier this detection still has to convict.