feat: Implement syntactic sugar and site-specific discovery config

- Add syntactic sugar for container transformation: .insertr containers → children get .insertr
- Fix discovery auto-running when disabled with site-specific config loading
- Add comprehensive styling test examples for HTML attribute preservation
- Include test input for syntactic sugar validation
- Update discovery defaults to respect developer intent (disabled by default)

cmd/serve.go

@@ -138,6 +138,26 @@ func runServe(cmd *cobra.Command, args []string) {
 					if autoEnhance, ok := configMap["auto_enhance"].(bool); ok {
 						site.AutoEnhance = autoEnhance
 					}
+					// Parse discovery config if present
+					if discoveryMap, ok := configMap["discovery"].(map[string]interface{}); ok {
+						discovery := &content.DiscoveryConfig{
+							Containers: true, // defaults
+							Individual: true,
+						}
+						if enabled, ok := discoveryMap["enabled"].(bool); ok {
+							discovery.Enabled = enabled
+						}
+						if aggressive, ok := discoveryMap["aggressive"].(bool); ok {
+							discovery.Aggressive = aggressive
+						}
+						if containers, ok := discoveryMap["containers"].(bool); ok {
+							discovery.Containers = containers
+						}
+						if individual, ok := discoveryMap["individual"].(bool); ok {
+							discovery.Individual = individual
+						}
+						site.Discovery = discovery
+					}
 					if site.SiteID != "" && site.Path != "" {
 						sites = append(sites, site)
 					}