feat: recognise Charm Crush client (#217)

Adds Charm Crush client recognition to guessClient based on user agent header.

Author: pawbana

client.go

@@ -17,6 +17,7 @@ const (
 	ClientCopilotCLI  Client = "GitHub Copilot (CLI)"
 	ClientKilo        Client = "Kilo Code"
 	ClientCoderAgents Client = "Coder Agents"
+	ClientCrush       Client = "Charm Crush"
 	ClientMux         Client = "Mux"
 	ClientRoo         Client = "Roo Code"
 	ClientCursor      Client = "Cursor"
@@ -50,6 +51,8 @@ func guessClient(r *http.Request) Client {
 		return ClientRoo
 	case strings.HasPrefix(userAgent, "coder-agents/"):
 		return ClientCoderAgents
+	case strings.HasPrefix(userAgent, "charm crush/"):
+		return ClientCrush
 	case r.Header.Get("x-cursor-client-version") != "":
 		return ClientCursor
 	}

client_test.go

@@ -76,6 +76,11 @@ func TestGuessClient(t *testing.T) {
 			userAgent:  "coder-agents/v0.0.0-devel (darwin/arm64)",
 			wantClient: ClientCoderAgents,
 		},
+		{
+			name:       "charm_crush",
+			userAgent:  "Charm Crush/0.1.11",
+			wantClient: ClientCrush,
+		},
 		{
 			name:       "cursor_x_cursor_client_version",
 			userAgent:  "connect-es/1.6.1",