fix(install): disable chart namespace template to avoid collision

The CLI creates the sympozium-system namespace via Helm's
install.CreateNamespace flag, while the chart's templates/namespace.yaml
also rendered a Namespace resource (createNamespace=true by default).
Both racing produced "namespaces \"sympozium-system\" already exists"
on install, leaving a failed release with orphaned resources.

Default createNamespace=false in buildHelmValues so the chart template
is skipped; --set can still override for standalone chart use.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: AlexsJones

cmd/sympozium/main.go

@@ -1240,6 +1240,10 @@ func newHelmConfig(ns string) (*action.Configuration, error) {
 // buildHelmValues constructs a Helm values map from CLI flags.
 func buildHelmValues(imageTag string, setValues []string) (map[string]interface{}, error) {
 	vals := make(map[string]interface{})
+	// The CLI manages namespace creation itself via Helm's install.CreateNamespace
+	// flag, so disable the chart's own Namespace template to avoid the two
+	// racing and producing an "already exists" error on install.
+	vals["createNamespace"] = false
 	if imageTag != "" {
 		vals["image"] = map[string]interface{}{
 			"tag": imageTag,