feat(provider): add Gelios SDK package v2

packages/external-provider-contract/providers/gelios/v2/README.md

@@ -0,0 +1,16 @@
+# Gelios provider package v2
+
+Version 2 keeps the provider-neutral `fleet.positions.current.v1` mapping and
+switches the Robot2B connection transport to the durable Gelios SDK token that
+is already used by the legacy Engine/Cesium contour.
+
+- endpoint: `GET https://admin.geliospro.com/sdk/`;
+- static query: `svc=get_units`, `params={}`;
+- secret query parameter: `token`, injected only by native NDC L2
+  `httpQueryAuth` credentials;
+- token lifecycle: one durable access artifact, no refresh operation;
+- graph/package/logs never contain the token value.
+
+The v1 REST bearer package remains immutable historical evidence. A v2
+connection must use a separately registered native Query Auth credential whose
+name is `token`; it must not reinterpret an SDK token as an HTTP Bearer token.