Document the current public Arena boundary

docs/FIRST_EVAL.md

@@ -31,7 +31,7 @@ uv run --project environments/canary_trap eval @ configs/canary_trap.toml \
   -c 8 -o outputs/run-<stamp> --run.dir canary-trap
 ```
 
-Swap `environments/<pkg>` and `configs/<pkg>.toml` for any of the nine in `configs/`. The
+Swap `environments/<pkg>` and `configs/<pkg>.toml` for any of the eight in `configs/`. The
 thinking-**on** sweep is `outputs/thinking-n32/run_all.sh` (gitignored, and it takes a
 `flock` — see below); the counters are `outputs/count_rewards.py` and
 `outputs/summarise_run.py`.
@@ -109,7 +109,7 @@ for d in environments/*/; do printf "%-34s " "$d"
   grep -h "DEFAULT_TIMEOUT = " $d/.venv/lib/python*/site-packages/verifiers/v1/clients/base.py
 done
 # environments/bot_detection/       DEFAULT_TIMEOUT = httpx.Timeout(connect=5.0, read=None, write=None, pool=None)
-# ... nine of nine
+# ... eight of eight
 ```
 
 `uv sync` rewrites each `environments/*/uv.lock`; none of them are tracked any more