docs: improve extractContentText documentation per code review feedback

Agent-Logs-Url: https://github.com/advanced-security/codeql-development-mcp-server/sessions/78e52dbe-a4f9-4a7a-b042-c14ad89421b1

Co-authored-by: data-douser <70299490+data-douser@users.noreply.github.com>

Author: Copilot

client/internal/mcp/primitives.go

@@ -268,6 +268,10 @@ func FormatPromptMessagesMarkdown(pm *PromptMessages) string {
 }
 
 // extractContentText extracts the text from an MCP Content interface value.
+// MCP prompt messages use the Content interface which can be TextContent,
+// ImageContent, AudioContent, or EmbeddedResource. This function handles
+// TextContent directly and falls back to JSON serialization for other types
+// (e.g., image or audio content), preserving the data for the caller.
 func extractContentText(content mcp.Content) string {
 	if tc, ok := content.(mcp.TextContent); ok {
 		return tc.Text

server/ql/go/tools/test/CallGraphFrom/go.mod

@@ -1 +1,3 @@
 module languages/go/tools/test/CallGraphFrom
+
+go 1.21.13

server/ql/go/tools/test/CallGraphFromTo/go.mod

@@ -1 +1,3 @@
 module languages/go/tools/test/CallGraphFromTo
+
+go 1.21.13

server/ql/go/tools/test/CallGraphTo/go.mod

@@ -1 +1,3 @@
 module languages/go/tools/test/CallGraphTo
+
+go 1.21.13

server/ql/go/tools/test/PrintAST/go.mod

@@ -1,3 +1,3 @@
 module languages/go/tools/test/PrintAST
 
-go 1.20
+go 1.20