fix: resolve CodeChecker findings and add CodeChecker ignore rules

- Refactor cause in draw_game_over_screen to an immediately invoked lambda, eliminating dead store warning
- Rename sound effect files to standard-compliant names without double underscores to prevent reserved macro warnings in soundbank.h
- Update source/game_audio.cpp to use clean SFX_* macro identifiers
- Add codechecker_skip.txt to ignore external devkitPro toolchain headers
- Ignore .codechecker/ output artifacts directory in .gitignore
- Update AGENTS.md file tree and sound asset references

.gitignore

@@ -55,6 +55,7 @@
 # Editor/LSP tooling caches
 /.cache/
 /.clang-tidy-db/
+/.codechecker/
 
 # CMake internals
 CMakeCache.txt

AGENTS.md

@@ -50,13 +50,13 @@ snakePlus/
 │
 ├── sounds/                     # Audio assets (built into soundbank by mmutil)
 │   ├── 0rigin.xm               # FastTracker II background music track (MOD_0RIGIN)
-│   ├── 273792__pacomav__plop.wav                                  # Movement plop SFX
-│   ├── 332629__treasuresounds__item-pickup.wav                    # Apple pickup SFX
-│   ├── Boom.wav                                                   # Rotten / Cursed apple boom SFX
-│   ├── denied.wav                                                  # Reverse-direction denied thud SFX (synthesized)
-│   ├── 167126__crisstanza__unpause.wav                            # Unpause SFX
-│   ├── 167127__crisstanza__pause.wav                              # Pause SFX
-│   └── 73750__timbre__remix-of-benboncan-sad-trombone-more-wah-bright-de-clicked.wav # Fail SFX
+│   ├── Boom.wav                # Rotten / Cursed apple boom SFX (SFX_BOOM)
+│   ├── denied.wav              # Reverse-direction denied thud SFX (SFX_DENIED)
+│   ├── pause.wav               # Pause SFX (SFX_PAUSE)
+│   ├── pickup.wav              # Apple pickup SFX (SFX_PICKUP)
+│   ├── plop.wav                # Movement plop SFX (SFX_PLOP)
+│   ├── sad_trombone.wav        # Fail SFX (SFX_SAD_TROMBONE)
+│   └── unpause.wav             # Unpause SFX (SFX_UNPAUSE)
 │
 ├── tools/                      # Tooling & automation scripts
 │   └── clang_tidy_watch.sh     # File watcher script running clang-tidy on file change
@@ -72,7 +72,8 @@ snakePlus/
 │
 ├── .clang-tidy                 # Clang-tidy rules and naming conventions
 ├── .clangd                     # Clangd LSP configuration and system include paths
-└── .gitignore                  # Git ignore rules for build artifacts and caches
+├── .gitignore                  # Git ignore rules for build artifacts and caches
+└── codechecker_skip.txt        # Skipfile for CodeChecker to omit external devkitPro headers
 ```
 
 ---

codechecker_skip.txt

@@ -0,0 +1,3 @@
+# Ignore external devkitPro toolchain and system library headers
+-/opt/devkitpro/*
++*

source/game_audio.cpp

@@ -8,16 +8,16 @@ void audio_setup(AudioContext &audio) {
 
     mmLoad(MOD_0RIGIN);
 
-    mmLoadEffect(SFX_332629__TREASURESOUNDS__ITEM_PICKUP);
+    mmLoadEffect(SFX_PICKUP);
     mmLoadEffect(SFX_BOOM);
-    mmLoadEffect(SFX_167127__CRISSTANZA__PAUSE);
-    mmLoadEffect(SFX_167126__CRISSTANZA__UNPAUSE);
-    mmLoadEffect(SFX_273792__PACOMAV__PLOP);
-    mmLoadEffect(SFX_73750__TIMBRE__REMIX_OF_BENBONCAN_SAD_TROMBONE_MORE_WAH_BRIGHT_DE_CLICKED);
+    mmLoadEffect(SFX_PAUSE);
+    mmLoadEffect(SFX_UNPAUSE);
+    mmLoadEffect(SFX_PLOP);
+    mmLoadEffect(SFX_SAD_TROMBONE);
     mmLoadEffect(SFX_DENIED);
 
     audio.sfx_pickup = {
-        { SFX_332629__TREASURESOUNDS__ITEM_PICKUP },
+        { SFX_PICKUP },
         static_cast<int>(1.0F * (1 << 10)),
         0,
         255,
@@ -33,7 +33,7 @@ void audio_setup(AudioContext &audio) {
     };
 
     audio.sfx_pause = {
-        { SFX_167127__CRISSTANZA__PAUSE },
+        { SFX_PAUSE },
         static_cast<int>(1.0F * (1 << 10)),
         2,
         255,
@@ -41,7 +41,7 @@ void audio_setup(AudioContext &audio) {
     };
 
     audio.sfx_unpause = {
-        { SFX_167126__CRISSTANZA__UNPAUSE },
+        { SFX_UNPAUSE },
         static_cast<int>(1.0F * (1 << 10)),
         3,
         255,
@@ -49,7 +49,7 @@ void audio_setup(AudioContext &audio) {
     };
 
     audio.sfx_plop = {
-        { SFX_273792__PACOMAV__PLOP },
+        { SFX_PLOP },
         static_cast<int>(1.0F * (1 << 10)),
         4,
         128,
@@ -57,7 +57,7 @@ void audio_setup(AudioContext &audio) {
     };
 
     audio.sfx_fail = {
-        { SFX_73750__TIMBRE__REMIX_OF_BENBONCAN_SAD_TROMBONE_MORE_WAH_BRIGHT_DE_CLICKED },
+        { SFX_SAD_TROMBONE },
         static_cast<int>(1.0F * (1 << 10)),
         4,
         255,

source/game_render.cpp

@@ -164,21 +164,18 @@ void draw_game_over_screen(const GameState &state) {
   iprintf("\x1b[8;4HDifficulty:    %s", state.hardMode ? "Hard  " : "Normal");
 
   iprintf("\x1b[10;4HCause of Defeat:");
-  const char *cause = "Collision";
-  switch (state.gameOverReason) {
-  case GameOverReason::SelfCollision:
-    cause = "Bite Collision (Hit Body)";
-    break;
-  case GameOverReason::BarrierCollision:
-    cause = "Energy Barrier Impact";
-    break;
-  case GameOverReason::RottenAppleDepleted:
-    cause = "Depleted by Rotten Apple";
-    break;
-  default:
-    cause = "Collision";
-    break;
-  }
+  const char *const cause = [&state]() {
+    switch (state.gameOverReason) {
+    case GameOverReason::SelfCollision:
+      return "Bite Collision (Hit Body)";
+    case GameOverReason::BarrierCollision:
+      return "Energy Barrier Impact";
+    case GameOverReason::RottenAppleDepleted:
+      return "Depleted by Rotten Apple";
+    default:
+      return "Collision";
+    }
+  }();
   iprintf("\x1b[11;4H  %s", cause);
 
   iprintf("\x1b[14;2H----------------------------");