# ADR 002: Evaluator scope is finish-circle plus collision/proximity

Status: accepted (Phase 2 honesty pass).

## Context

The evaluator docs claimed per-variant simulation (roundabout exit arms,
sign stop-lines, priority yield). The code checked the finish radius plus
collision/proximity for five of nine variants; the payload fields
(`enter`, `exit_at`, `give_way`, `signs`, `yield_`, `stop`) were unread.

## Decision

Document exactly what each variant checks (`objective.rs` module docs)
and pin it with behavior-locking tests. The payload fields stay as
reserved data. A variant earns a real check only with geometry/query
plumbing plus tests in the same change — never docs first.

## Consequences

- Roundabout/Signs/Priority/Hazards/FreeDrive are finish-circle by
  design, not by neglect. Say so out loud (the module doc does).
- Reopen per variant when its check is implemented; each reopening must
  update the doc AND the locking test together.