update nexus client and add tests

Author: internet-diglett

go.sum

@@ -136,8 +136,6 @@ github.com/mitchellh/reflectwalk v1.0.2 h1:G2LzWKi524PWgd3mLHV8Y5k7s6XUvT0Gef6zx
 github.com/mitchellh/reflectwalk v1.0.2/go.mod h1:mSTlrgnPZtwu0c4WaC2kGObEpuNDbx0jmZXqmk4esnw=
 github.com/oklog/run v1.0.0 h1:Ru7dDtJNOyC66gQ5dQmaCa0qIsAUFY3sFpK1Xk8igrw=
 github.com/oklog/run v1.0.0/go.mod h1:dlhp/R75TPv97u0XWUtDeV/lRKWPKSdTuV0TZvrmrQA=
-github.com/oxidecomputer/oxide.go v0.5.0 h1:bT5FPUmczVcS84NCLdJZ5PAWHMhINz99QQVLImnd5Sc=
-github.com/oxidecomputer/oxide.go v0.5.0/go.mod h1:4gfHlxdBQLs/34UbChPvINd+pGNAnGlASRGEd4xIz1Y=
 github.com/oxidecomputer/oxide.go v0.5.1-0.20250626233125-a289a27e6ee3 h1:ygKfgi43iAJeqrAuheTGUmY0zrPE6Vyq5WTZUvbfLJw=
 github.com/oxidecomputer/oxide.go v0.5.1-0.20250626233125-a289a27e6ee3/go.mod h1:4gfHlxdBQLs/34UbChPvINd+pGNAnGlASRGEd4xIz1Y=
 github.com/pelletier/go-toml v1.9.5 h1:4yBQzkHv+7BHq2PQUZF3Mx0IYxG7LsP222s7Agd3ve8=