feat: add Copilot instructions and guidelines for unit tests and release notes

.vscode/mcp.json

@@ -0,0 +1,9 @@
+{
+	"servers": {
+		"github": {
+			"url": "https://api.githubcopilot.com/mcp/",
+			"type": "http"
+		}
+	},
+	"inputs": []
+}

.vscode/settings.json

@@ -0,0 +1,15 @@
+{
+  "github.copilot.chat.reviewSelection.instructions": [
+    {
+      "text": "Review the code changes carefully before accepting them."
+    }
+  ],
+  "github.copilot.chat.commitMessageGeneration.instructions": [
+    {
+      "text": "Use conventional commit message format."
+    }
+  ],
+  "github.copilot.chat.pullRequestDescriptionGeneration.instructions": [
+    { "text": "Always include a list of key changes." }
+  ]
+}