fix: make safe mode disable both experimental and debug features

The R_IsFeatureEnabled function only checked for experimental features when
determining safe mode restrictions, allowing debug features to bypass safe
mode. This caused debug features like r_fullbright and r_showtris to be
incorrectly reported as enabled in status logs even in safe mode.

Changes:
- Added R_IsDebugFeature function to check if a feature is debug-only
- Updated R_IsFeatureEnabled to disable both experimental AND debug features
  when safe mode is active
- Added function prototype for R_IsDebugFeature in header

This ensures safe mode properly disables all non-production features as intended.

Author: timfox

src/renderers/renderer_features.c

@@ -179,7 +179,11 @@ R_IsFeatureEnabled
 qboolean R_IsFeatureEnabled(const char *feature_name) {
     // This function is used during initialization when cvars may not be accessible
     // Assume features are enabled by default unless safe mode restricts them
-    return !g_safe_mode.enabled || !R_IsExperimentalFeature(feature_name);
+    if (g_safe_mode.enabled) {
+        // In safe mode, disable both experimental and debug features
+        return !R_IsExperimentalFeature(feature_name) && !R_IsDebugFeature(feature_name);
+    }
+    return qtrue;
 }
 
 /*
@@ -203,6 +207,27 @@ qboolean R_IsExperimentalFeature(const char *feature_name) {
     return qfalse;
 }
 
+/*
+===============
+R_IsDebugFeature
+===============
+*/
+qboolean R_IsDebugFeature(const char *feature_name) {
+    // Check all feature arrays
+    const renderer_feature_t *all_features[] = { common_features, vulkan_features, opengl_features };
+    int counts[] = { ARRAY_LEN(common_features), ARRAY_LEN(vulkan_features), ARRAY_LEN(opengl_features) };
+
+    for (int i = 0; i < ARRAY_LEN(all_features); i++) {
+        for (int j = 0; j < counts[i]; j++) {
+            if (Q_stricmp(all_features[i][j].name, feature_name) == 0) {
+                return (all_features[i][j].category == FEATURE_DEBUG);
+            }
+        }
+    }
+
+    return qfalse;
+}
+
 //==============================================================================
 // LOGGING FUNCTIONS
 //==============================================================================

src/renderers/renderer_features.h

@@ -268,6 +268,7 @@ void R_SetSafeMode(qboolean enable, const char *reason);
 feature_state_t R_GetFeatureState(const char *feature_name);
 qboolean R_IsFeatureEnabled(const char *feature_name);
 qboolean R_IsExperimentalFeature(const char *feature_name);
+qboolean R_IsDebugFeature(const char *feature_name);
 
 // Startup logging
 void R_LogRendererInfo(const char *renderer_name, const char *version);