docs: Metis is not yet metered; document the decisions endpoint in API access

models.md claimed decisions count toward the member allowance. Verified today that a
/v1/systemone call registers no spend against the calling key, so the claim was wrong.
States the gap plainly instead. api-access.md now names the decisions route, the fact
that it is not an OpenAI chat endpoint, and the metering caveat.

models.md

@@ -227,10 +227,12 @@ curl https://gateway.inference.coop/v1/systemone \
 ```
 
 Metis is hosted by **GreenPT** — the same policy-based privacy, EU hosting, and
-100% renewable energy as the 🌱 chat models. Metering on this route is
-**approximate**: the gateway bills a small flat amount per call rather than the
-exact token count, so treat its spend figure as an estimate (it still counts
-toward your allowance).
+100% renewable energy as the 🌱 chat models. **Metering on this route is not yet active.** Verified 2026-11-03: a call to
+`/v1/systemone` returns a correct answer but registers no spend against the
+key that made it, so decisions currently do not count toward your monthly
+allowance. That is a gap on our side, not a policy — the intent is that
+decisions draw on the same allowance as everything else. Until it is fixed,
+please use the route in the spirit of the allowance it is meant to share.
 
 ## Limitations on privacy