Add azure-sql-developer plugin (#4292)

.claude-plugin/marketplace.json

@@ -487,6 +487,20 @@
       "category": "database",
       "homepage": "https://github.com/AzureCosmosDB/cosmosdb-claude-code-plugin"
     },
+    {
+      "name": "azure-sql-developer",
+      "description": "Agent skills for Azure SQL Developer, the Azure SQL Database engine running locally in a container. Teaches your agent to run the engine, connect, migrate, scaffold, build RAG, wire CI, and go local-to-cloud, using the real Private Preview image instead of the SQL Server image.",
+      "author": {
+        "name": "Microsoft"
+      },
+      "category": "database",
+      "source": {
+        "source": "url",
+        "url": "https://github.com/microsoft/azure-sql-database-container.git",
+        "sha": "c64639ce9d03731180560ccca214695892a72fe4"
+      },
+      "homepage": "https://github.com/microsoft/azure-sql-database-container"
+    },
     {
       "name": "base44",
       "description": "Build and deploy Base44 full-stack apps with CLI project management and JavaScript/TypeScript SDK development skills",