refactor: invert FATAL_CHECK logic to standard assertion style

- Inverted FATAL_CHECK macro to crash if condition is FALSE (standard assertion)
- Updated all call sites in audio, GPU, and CNN subsystems
- Updated documentation and examples
- Recorded completion in doc/COMPLETED.md

1 files changed, 6 insertions, 6 deletions

diff --git a/src/gpu/sequence_v2.cc b/src/gpu/sequence_v2.cc
index 9e30db0..7c44085 100644
--- a/src/gpu/sequence_v2.cc
+++ b/src/gpu/sequence_v2.cc
@@ -38,7 +38,7 @@ NodeRegistry::~NodeRegistry() {
 
 void NodeRegistry::declare_node(const std::string& name, NodeType type,
                                  int width, int height) {
-  FATAL_CHECK(nodes_.find(name) != nodes_.end(),
+  FATAL_CHECK(nodes_.find(name) == nodes_.end(),
               "Node already declared: %s\n", name.c_str());
 
   if (width <= 0)
@@ -57,9 +57,9 @@ void NodeRegistry::declare_node(const std::string& name, NodeType type,
 
 void NodeRegistry::declare_aliased_node(const std::string& name,
                                         const std::string& alias_of) {
-  FATAL_CHECK(nodes_.find(alias_of) == nodes_.end(),
+  FATAL_CHECK(nodes_.find(alias_of) != nodes_.end(),
               "Alias target does not exist: %s\n", alias_of.c_str());
-  FATAL_CHECK(aliases_.find(name) != aliases_.end(), "Alias already exists: %s\n",
+  FATAL_CHECK(aliases_.find(name) == aliases_.end(), "Alias already exists: %s\n",
               name.c_str());
 
   aliases_[name] = alias_of;
@@ -73,7 +73,7 @@ WGPUTextureView NodeRegistry::get_view(const std::string& name) {
   }
 
   auto it = nodes_.find(name);
-  FATAL_CHECK(it == nodes_.end(), "Node not found: %s\n", name.c_str());
+  FATAL_CHECK(it != nodes_.end(), "Node not found: %s\n", name.c_str());
   return it->second.view;
 }
 
@@ -161,7 +161,7 @@ void NodeRegistry::create_texture(Node& node) {
   desc.sampleCount = 1;
 
   node.texture = wgpuDeviceCreateTexture(device_, &desc);
-  FATAL_CHECK(node.texture == nullptr, "Failed to create texture\n");
+  FATAL_CHECK(node.texture != nullptr, "Failed to create texture\n");
 
   WGPUTextureViewDescriptor view_desc = {};
   view_desc.format = format;
@@ -175,7 +175,7 @@ void NodeRegistry::create_texture(Node& node) {
                          : WGPUTextureAspect_All;
 
   node.view = wgpuTextureCreateView(node.texture, &view_desc);
-  FATAL_CHECK(node.view == nullptr, "Failed to create texture view\n");
+  FATAL_CHECK(node.view != nullptr, "Failed to create texture view\n");
 }
 
 // SequenceV2 implementation