chore: remove redundant files, fix app:setup symlinks

- Remove antigravity-awesome-skills-5.9.0.tgz (npm pack artifact)
- Remove .DS_Store from tracking
- Stop tracking web-app/public/skills and skills.json (generated by app:setup)
- Add .DS_Store, .ruff_cache, *.tgz, web-app/public/skills to .gitignore
- Fix setup_web.js: use statSync to follow symlinks (fixes ENOTDIR on CLAUDE.md)

Made-with: Cursor

web-app/public/skills/unreal-engine-cpp-pro/examples/ExampleActor.cpp

@@ -1,43 +0,0 @@
-#include "ExampleActor.h"
-#include "Components/BoxComponent.h"
-#include "Kismet/GameplayStatics.h"
-
-// Define a static log category for this specific file/module
-DEFINE_LOG_CATEGORY_STATIC(LogExampleActor, Log, All);
-
-AExampleActor::AExampleActor()
-{
-    // Default to strict settings
-    PrimaryActorTick.bCanEverTick = false; 
-    PrimaryActorTick.bStartWithTickEnabled = false;
-
-    RootCollision = CreateDefaultSubobject<UBoxComponent>(TEXT("RootCollision"));
-    RootComponent = RootCollision;
-    
-    bIsActive = true;
-}
-
-void AExampleActor::BeginPlay()
-{
-    Super::BeginPlay();
-    
-    // Cache references here, not in Tick
-    CachedPC = UGameplayStatics::GetPlayerController(this, 0);
-
-    if (bIsActive)
-    {
-        UE_LOG(LogExampleActor, Log, TEXT("ExampleActor %s started!"), *GetName());
-    }
-}
-
-void AExampleActor::EndPlay(const EEndPlayReason::Type EndPlayReason)
-{
-    // Clean up any strict delegates or handles here
-    Super::EndPlay(EndPlayReason);
-}
-
-void AExampleActor::Tick(float DeltaTime)
-{
-    Super::Tick(DeltaTime);
-    // Ticking is disabled by default in constructor, so this won't run unless enabled explicitly.
-}