tier ladder — c0 to c3

ws-p / d14 visible-invisible. each pill below mounts with a forced tier so you can see the full escalation envelope on one screen. open devtools network to watch /api/challenge/init + /api/challenge/resolve.

c0 — invisible auto-check

passive fingerprint → scanline + diamond glyph, no popover. ~1200ms total.

c1 — single judgment

one unit, popover anchored to pill. ≤10s budget.

c2 — public mix

2 units across types. retry counter visible.

c3 — multi-turn expert

3+ harder units. fail-any → retry SAME set.

panel — ws-p demo. animation total budget ≤1500ms. all 4 tiers wire to /api/challenge/{init,resolve}. site_key: pk_demo_a.