docs: Metis decisions now count toward the allowance

Metering on /v1/systemone is live: each call is billed at $0.12 per 1M
input tokens, computed from the exact token count GreenPT returns and
attributed to the calling member key. Replace the "not yet metered"
warnings in models.md and api-access.md with the accurate position.

(metering verified 2026-11-03; code/litellm patch_passthrough_token_cost.py)

models.md

@@ -227,12 +227,11 @@ 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 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.
+100% renewable energy as the 🌱 chat models. **Decisions count toward your
+monthly allowance**, like every other call: each request is metered at
+**$0.12 per 1M input tokens**, computed from the exact token count GreenPT
+reports back, and appears in your usage record alongside your chat calls.
+(Metis generates no prose, so there is no output charge.)
 
 ## Limitations on privacy