Add Cloud Agent development environment

.cursor/Dockerfile

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+# Development environment for the SingleStore .NET Connector.
+#
+# The .NET 10 SDK is pinned because CI targets net10.0 (see
+# .github/workflows/config.yml) and this single SDK can build every framework
+# the connector multi-targets (net462/471/48, netstandard2.0/2.1, net6.0/8.0/9.0/10.0)
+# by restoring reference packs on demand.
+FROM mcr.microsoft.com/dotnet/sdk:10.0
+
+ENV DOTNET_CLI_TELEMETRY_OPTOUT=1 \
+    DOTNET_NOLOGO=1 \
+    DOTNET_SKIP_FIRST_TIME_EXPERIENCE=1
+
+# git and curl support source control and tooling; the MySQL/MariaDB client is
+# used by the repository's SingleStore integration-test helper scripts under
+# .github/workflows and .ci.
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+        ca-certificates \
+        curl \
+        git \
+        default-mysql-client \
+    && rm -rf /var/lib/apt/lists/*

.cursor/environment.json

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+{
+  "name": "SingleStore .NET Connector",
+  "user": "root",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+  "install": "dotnet restore SingleStoreConnector.slnx && dotnet build -c Release"
+}