feat: make projects toolset a default toolset

The projects toolset (`projects_list`, `projects_get`, `projects_write`)
is fully implemented but not included in the default toolset
configuration. This means users of the remote MCP server or Claude
Desktop's URL connector have no access to GitHub Projects v2 tools
unless they explicitly configure the `projects` toolset via URL paths
or custom headers.

Mark `ToolsetMetadataProjects` with `Default: true` so that project
board tools are available out of the box, matching the README's
advertised capabilities.

Closes #2275

Author: yani-

pkg/github/tools.go

@@ -116,6 +116,7 @@ var (
 		ID:               "projects",
 		Description:      "GitHub Projects related tools",
 		Icon:             "project",
+		Default:          true,
 		InstructionsFunc: generateProjectsToolsetInstructions,
 	}
 	ToolsetMetadataStargazers = inventory.ToolsetMetadata{

pkg/github/tools_test.go

@@ -26,6 +26,7 @@ func TestAddDefaultToolset(t *testing.T) {
 				"copilot",
 				"repos",
 				"issues",
+				"projects",
 				"pull_requests",
 				"users",
 			},
@@ -40,6 +41,7 @@ func TestAddDefaultToolset(t *testing.T) {
 				"copilot",
 				"repos",
 				"issues",
+				"projects",
 				"pull_requests",
 				"users",
 			},
@@ -52,6 +54,7 @@ func TestAddDefaultToolset(t *testing.T) {
 				"copilot",
 				"repos",
 				"issues",
+				"projects",
 				"pull_requests",
 				"users",
 			},