qa: make the demo walkable — terrain collision root cause, spawn, scripted QA

The reported fall-through was a misdiagnosis: the player never fell. The
imported Terrain_DEM had only a bounding-box simple collision proxy, so a
downward trace anywhere in the block hit the terrain at Z 819 (the mesh
bbox max) and the street sat under an invisible 8 m lid. Standing on that
box looked plausible, which is why it read as working.

- add UGigLineAssetTools (C++): force CTF_UseComplexAsSimple on a static
  mesh. UE 5.8 dropped bUseComplexAsSimpleCollision and Python cannot set
  the flag; the builder also saves the asset, since the flag lives there
  and a map-only save silently reverts it.
- spawn (-13336, -1150, 600): inside the carved corridor (the cut is a
  10.7 m half-width around the road centreline), lands on the road at 456.
- fix ResetToStart returning to the mid-air PlayerStart captured in
  BeginPlay: StartLocation is now captured on the first grounded frame.
- HighResShot 1280x720 instead of "1280 720", which is a multiplier.
- add -qaselftest: scripted walk/reset/pause on a core ticker plus a
  swept ground transect. Results: walk 746 cm/2 s with Z steady, reset
  0 cm from spawn, pause/unpause 1/0, transect 84 samples 0 holes.
- rebase onto main, keeping the frontage materials and placement fixes.

Game/GigLine/Source/GigLine/GigLineAssetTools.cpp

@@ -0,0 +1,65 @@
+#include "GigLineAssetTools.h"
+
+#include "Engine/StaticMesh.h"
+#include "PhysicsEngine/BodySetup.h"
+#include "StaticMeshResources.h"
+
+void UGigLineAssetTools::SetComplexCollisionAsSimple(UStaticMesh* Mesh, bool bEnable)
+{
+	if (!Mesh)
+	{
+		return;
+	}
+
+	UBodySetup* BodySetup = Mesh->GetBodySetup();
+	if (!BodySetup)
+	{
+		return;
+	}
+
+	BodySetup->CollisionTraceFlag = bEnable ? CTF_UseComplexAsSimple : CTF_UseSimpleAndComplex;
+	BodySetup->InvalidatePhysicsData();
+	BodySetup->CreatePhysicsMeshes();
+	Mesh->MarkPackageDirty();
+	Mesh->PostEditChange();
+}
+
+void UGigLineAssetTools::ClearSimpleCollision(UStaticMesh* Mesh)
+{
+	if (!Mesh)
+	{
+		return;
+	}
+
+	UBodySetup* BodySetup = Mesh->GetBodySetup();
+	if (!BodySetup)
+	{
+		return;
+	}
+
+	BodySetup->AggGeom.EmptyElements();
+	BodySetup->InvalidatePhysicsData();
+	BodySetup->CreatePhysicsMeshes();
+	Mesh->MarkPackageDirty();
+	Mesh->PostEditChange();
+}
+
+FString UGigLineAssetTools::GetCollisionComplexity(UStaticMesh* Mesh)
+{
+	if (!Mesh)
+	{
+		return TEXT("no mesh");
+	}
+
+	const UBodySetup* BodySetup = Mesh->GetBodySetup();
+	if (!BodySetup)
+	{
+		return TEXT("no body setup");
+	}
+
+	const int32 Flag = static_cast<int32>(BodySetup->CollisionTraceFlag.GetValue());
+	if (Flag == CTF_UseComplexAsSimple) { return TEXT("UseComplexAsSimple"); }
+	if (Flag == CTF_UseSimpleAsComplex) { return TEXT("UseSimpleAsComplex"); }
+	if (Flag == CTF_UseSimpleAndComplex) { return TEXT("UseSimpleAndComplex"); }
+	return TEXT("ProjectDefault");
+}

Game/GigLine/Source/GigLine/GigLineAssetTools.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include "CoreMinimal.h"
+#include "Kismet/BlueprintFunctionLibrary.h"
+#include "GigLineAssetTools.generated.h"
+
+class UStaticMesh;
+
+/**
+ * Small editor-side helpers for the headless asset pipeline scripts.
+ *
+ * Exposed to Python so tools can fix up imported meshes that the Interchange
+ * importer gives unusable default collision. The terrain is the motivating
+ * case: without complex-as-simple it gets a bounding-box proxy, so the whole
+ * street sits under an invisible 8 m box and the player walks on the box lid.
+ */
+UCLASS()
+class GIGLINE_API UGigLineAssetTools : public UBlueprintFunctionLibrary
+{
+	GENERATED_BODY()
+
+public:
+	/** Make collision trace against the mesh triangles instead of a proxy hull. */
+	UFUNCTION(BlueprintCallable, Category = "GigLine|Assets")
+	static void SetComplexCollisionAsSimple(UStaticMesh* Mesh, bool bEnable = true);
+
+	/** Drop any generated simple collision (hulls/boxes) from the mesh. */
+	UFUNCTION(BlueprintCallable, Category = "GigLine|Assets")
+	static void ClearSimpleCollision(UStaticMesh* Mesh);
+
+	/** Report the current collision complexity: "SimpleAndComplex", "Simple", ... */
+	UFUNCTION(BlueprintCallable, Category = "GigLine|Assets")
+	static FString GetCollisionComplexity(UStaticMesh* Mesh);
+};

Game/GigLine/Source/GigLine/GigLineCharacter.cpp

@@ -7,8 +7,13 @@
 #include "GameFramework/CharacterMovementComponent.h"
 #include "GameFramework/PlayerController.h"
 #include "InputAction.h"
-#include "GameFramework/PlayerController.h"
 #include "InputMappingContext.h"
+#include "Engine/World.h"
+#include "TimerManager.h"
+#include "Containers/Ticker.h"
+#include "Kismet/GameplayStatics.h"
+#include "Misc/CommandLine.h"
+#include "Misc/Parse.h"
 
 AGigLineCharacter::AGigLineCharacter()
 {
@@ -39,51 +44,56 @@ AGigLineCharacter::AGigLineCharacter()
 	GetMesh()->SetHiddenInGame(true);
 	GetMesh()->SetCollisionEnabled(ECollisionEnabled::NoCollision);
 
-	// Input assets are created by Tools/ue_create_input_assets.py. They are loaded in
-	// BeginPlay rather than the constructor: the constructor runs during CDO
-	// construction where asset loads are unreliable, and a missing asset should be
-	// a loud warning, not a silent no-op.
-}
+	// Hard-reference the Enhanced Input assets with ConstructorHelpers so the
+	// cooker always includes them and they load during CDO construction. Runtime
+	// soft-loading them at BeginPlay was fragile: the assets were pruned from the
+	// pak unless /Game/Input was force-cooked, and a soft path can miss while the
+	// IoStore registry is still mounting. A constructor FObjectFinder is a hard
+	// reference (followed by the cooker) and loads deterministically.
+	// Assets are created by Tools/ue_create_input_assets.py.
+	static ConstructorHelpers::FObjectFinder<UInputMappingContext> CtxFinder(
+		TEXT("/Game/Input/IMC_Default.IMC_Default"));
+	static ConstructorHelpers::FObjectFinder<UInputAction> MoveF(
+		TEXT("/Game/Input/IA_Move.IA_Move"));
+	static ConstructorHelpers::FObjectFinder<UInputAction> StrafeF(
+		TEXT("/Game/Input/IA_Strafe.IA_Strafe"));
+	static ConstructorHelpers::FObjectFinder<UInputAction> BackF(
+		TEXT("/Game/Input/IA_MoveBack.IA_MoveBack"));
+	static ConstructorHelpers::FObjectFinder<UInputAction> LeftF(
+		TEXT("/Game/Input/IA_StrafeLeft.IA_StrafeLeft"));
+	static ConstructorHelpers::FObjectFinder<UInputAction> LookF(
+		TEXT("/Game/Input/IA_Look.IA_Look"));
+	static ConstructorHelpers::FObjectFinder<UInputAction> JumpF(
+		TEXT("/Game/Input/IA_Jump.IA_Jump"));
+	static ConstructorHelpers::FObjectFinder<UInputAction> ResetF(
+		TEXT("/Game/Input/IA_Reset.IA_Reset"));
+	static ConstructorHelpers::FObjectFinder<UInputAction> PauseF(
+		TEXT("/Game/Input/IA_Pause.IA_Pause"));
 
-void AGigLineCharacter::LoadInputAssets()
-{
-	auto LoadSoft = [](const TCHAR* Path) -> TObjectPtr<UObject>
-	{
-		return LoadObject<UObject>(nullptr, Path);
-	};
-	MappingContext = Cast<UInputMappingContext>(LoadSoft(TEXT("/Game/Input/IMC_Default.IMC_Default")));
-	MoveAction = Cast<UInputAction>(LoadSoft(TEXT("/Game/Input/IA_Move.IA_Move")));
-	StrafeAction = Cast<UInputAction>(LoadSoft(TEXT("/Game/Input/IA_Strafe.IA_Strafe")));
-	MoveBackAction = Cast<UInputAction>(LoadSoft(TEXT("/Game/Input/IA_MoveBack.IA_MoveBack")));
-	StrafeLeftAction = Cast<UInputAction>(LoadSoft(TEXT("/Game/Input/IA_StrafeLeft.IA_StrafeLeft")));
-	LookAction = Cast<UInputAction>(LoadSoft(TEXT("/Game/Input/IA_Look.IA_Look")));
-	JumpAction = Cast<UInputAction>(LoadSoft(TEXT("/Game/Input/IA_Jump.IA_Jump")));
-	ResetAction = Cast<UInputAction>(LoadSoft(TEXT("/Game/Input/IA_Reset.IA_Reset")));
-	PauseAction = Cast<UInputAction>(LoadSoft(TEXT("/Game/Input/IA_Pause.IA_Pause")));
+	MappingContext = CtxFinder.Object;
+	MoveAction = MoveF.Object;
+	StrafeAction = StrafeF.Object;
+	MoveBackAction = BackF.Object;
+	StrafeLeftAction = LeftF.Object;
+	LookAction = LookF.Object;
+	JumpAction = JumpF.Object;
+	ResetAction = ResetF.Object;
+	PauseAction = PauseF.Object;
 
 	if (!MappingContext || !MoveAction || !MoveBackAction || !StrafeAction || !StrafeLeftAction
 		|| !LookAction)
 	{
 		UE_LOG(LogTemp, Warning,
-			TEXT("GigLine: input assets missing (context=%s move=%s look=%s). ")
-			TEXT("Run Tools/ue_create_input_assets.py to build /Game/Input."),
-			MappingContext ? TEXT("ok") : TEXT("missing"),
-			(MoveAction && MoveBackAction && StrafeAction && StrafeLeftAction) ? TEXT("ok")
-																				: TEXT("missing"),
-			LookAction ? TEXT("ok") : TEXT("missing"));
+			TEXT("GigLine: input assets failed to load at construction. ")
+			TEXT("Run Tools/ue_create_input_assets.py to build /Game/Input."));
 	}
 }
 
-void AGigLineCharacter::BeginPlay()
+void AGigLineCharacter::LoadInputAssets()
 {
-	Super::BeginPlay();
-
-	LoadInputAssets();
-
-	StartLocation = GetActorLocation();
-	StartRotation = GetActorRotation();
-
-	// Push the mapping context for this local player.
+	// The assets are hard-referenced and loaded in the constructor. This pushes
+	// the now-valid mapping context to the local player's subsystem; called from
+	// SetupPlayerInputComponent at possession, when the controller exists.
 	if (MappingContext)
 	{
 		if (const APlayerController* PC = Cast<APlayerController>(GetController()))
@@ -92,11 +102,250 @@ void AGigLineCharacter::BeginPlay()
 					ULocalPlayer::GetSubsystem<UEnhancedInputLocalPlayerSubsystem>(PC->GetLocalPlayer()))
 			{
 				Subsystem->AddMappingContext(MappingContext, 0);
+				UE_LOG(LogTemp, Log, TEXT("GigLine IN: pushed mapping context %s"),
+					*MappingContext->GetName());
+			}
+			else
+			{
+				UE_LOG(LogTemp, Log, TEXT("GigLine IN: no enhanced input subsystem on local player"));
 			}
 		}
+		else
+		{
+			UE_LOG(LogTemp, Log, TEXT("GigLine IN: no PlayerController at LoadInputAssets"));
+		}
 	}
 }
 
+void AGigLineCharacter::BeginPlay()
+{
+	Super::BeginPlay();
+
+	StartLocation = GetActorLocation();
+	StartRotation = GetActorRotation();
+
+	// The PlayerStart sits above grade so the capsule cannot spawn embedded, so
+	// the BeginPlay position is mid-air. Re-capture once the pawn has landed,
+	// otherwise Reset drops the player 1.4 m back into the air every press.
+	// Repeat until the first grounded frame. A single late timer is wrong: it can
+	// fire after the player (or the QA self-test) has already started walking,
+	// which recorded a mid-stride position as "start".
+	GetWorldTimerManager().SetTimer(SettleHandle, [this]()
+	{
+		if (bQATestWalking)
+		{
+			return; // keep waiting; the test walks almost immediately
+		}
+		if (const UCharacterMovementComponent* Mov = GetCharacterMovement())
+		{
+			if (Mov->IsMovingOnGround())
+			{
+				StartLocation = GetActorLocation();
+				StartRotation = GetActorRotation();
+				GetWorldTimerManager().ClearTimer(this->SettleHandle);
+				UE_LOG(LogTemp, Log, TEXT("GigLine: start captured on ground at Z %.0f"),
+					StartLocation.Z);
+			}
+		}
+	}, 0.25f, true);
+
+	// Force game input mode + focus + mouse capture so keyboard/mouse reach the
+	// pawn regardless of window focus quirks.
+	if (APlayerController* PC = Cast<APlayerController>(GetController()))
+	{
+		PC->SetInputMode(FInputModeGameOnly());
+		PC->bShowMouseCursor = false;
+	}
+
+	// TEMP QA: one screenshot at +1.5s so the actual frame is reviewable.
+	FTimerHandle ShotHandle;
+	GetWorldTimerManager().SetTimer(ShotHandle, [this]()
+	{
+		if (APlayerController* PC = Cast<APlayerController>(GetController()))
+		{
+			PC->ConsoleCommand(TEXT("HighResShot 1280x720"));
+		}
+	}, 1.5f, false);
+
+	// TEMP QA: every second log world time + capsule Z + gravity + fall state so
+	// we can see whether the world is simulating the pawn at all (symptom:
+	// "spawns above ground but never falls, no input").
+	FTimerHandle SimHandle;
+	GetWorldTimerManager().SetTimer(SimHandle, [this]()
+	{
+		UCharacterMovementComponent* M = GetCharacterMovement();
+		UE_LOG(LogTemp, Log,
+			TEXT("GigLine SIM: t=%.2f XYZ=(%.0f,%.0f,%.0f) grav=%.1f fall=%d local=%d role=%d mode=%d ctrl=%s"),
+			GetWorld() ? GetWorld()->GetTimeSeconds() : -1.f,
+			GetActorLocation().X, GetActorLocation().Y, GetActorLocation().Z,
+			M ? M->GetGravityZ() : 0.f,
+			(M && M->IsFalling()) ? 1 : 0,
+			IsLocallyControlled() ? 1 : 0,
+			(int)GetLocalRole(),
+			M ? (int)M->MovementMode : -1,
+			GetController() ? *GetController()->GetName() : TEXT("NONE"));
+		if (UWorld* W = GetWorld())
+		{
+			const FVector L = GetActorLocation();
+			FHitResult Hit;
+			FCollisionQueryParams Q(TEXT("GigLineGroundProbe"), false, this);
+			const bool bHit = W->LineTraceSingleByChannel(Hit,
+				FVector(L.X, L.Y, 3000.f), FVector(L.X, L.Y, -3000.f), ECC_Visibility, Q);
+			UE_LOG(LogTemp, Log, TEXT("GigLine GROUND: top=%.0f actor=%s"),
+				bHit ? Hit.ImpactPoint.Z : -9999.f,
+				bHit && Hit.GetActor() ? *Hit.GetActor()->GetActorLabel() : TEXT("none"));
+		}
+	}, 1.0f, true);
+
+	if (FParse::Param(FCommandLine::Get(), TEXT("qaselftest")))
+	{
+		StartQASelfTest();
+	}
+}
+
+void AGigLineCharacter::StartQASelfTest()
+{
+	// Driven by a core ticker rather than a world timer on purpose: pausing the
+	// game stops world timers, so a timer-based test would freeze the moment it
+	// proved pause works.
+	struct FQAState
+	{
+		float Elapsed = 0.0f;
+		FVector Start = FVector::ZeroVector;
+		FVector WalkEnd = FVector::ZeroVector;
+		float Step = 0.0f;
+		bool bWalkMoved = false;
+		bool bResetReturned = false;
+		bool bPausedOn = false;
+		bool bUnpausedBack = false;
+	};
+
+	TSharedPtr<FQAState> State = MakeShared<FQAState>();
+	State->Start = GetActorLocation();
+	UE_LOG(LogTemp, Log, TEXT("GigLine QA: start XYZ=(%.0f,%.0f,%.0f)"),
+		State->Start.X, State->Start.Y, State->Start.Z);
+
+	FTSTicker::GetCoreTicker().AddTicker(FTickerDelegate::CreateWeakLambda(this,
+		[this, State](float DeltaTime)
+		{
+			State->Elapsed += DeltaTime;
+			const float E = State->Elapsed;
+
+			// 1.0 - 3.0 s: hold forward. Reset sets the Step marker so each phase
+			// runs exactly once without an ever-growing if-chain.
+			if (E >= 1.0f && State->Step < 1.0f)
+			{
+				State->Step = 1.0f;
+				// Measure from the settled position, not the mid-air spawn point.
+				State->Start = GetActorLocation();
+				UE_LOG(LogTemp, Log, TEXT("GigLine QA: settled XYZ=(%.0f,%.0f,%.0f)"),
+					State->Start.X, State->Start.Y, State->Start.Z);
+				bQATestWalking = true;
+			}
+			if (bQATestWalking)
+			{
+				AddMovementInput(GetActorForwardVector(), 1.0f);
+			}
+
+			// 3.0: stop and measure.
+			if (E >= 3.0f && State->Step < 2.0f)
+			{
+				State->Step = 2.0f;
+				bQATestWalking = false;
+				State->WalkEnd = GetActorLocation();
+				const float Walked = FVector::Dist2D(State->Start, State->WalkEnd);
+				State->bWalkMoved = Walked > 200.0f; // >2 m in 2 s at 4 m/s
+				UE_LOG(LogTemp, Log,
+					TEXT("GigLine QA: walk moved %.0f cm in 2 s -> %s (Z %.0f -> %.0f)"),
+					Walked, State->bWalkMoved ? TEXT("PASS") : TEXT("FAIL"),
+					State->Start.Z, State->WalkEnd.Z);
+			}
+
+			// 3.5: reset should return to the spawn point.
+			if (E >= 3.5f && State->Step < 3.0f)
+			{
+				State->Step = 3.0f;
+				ResetToStart();
+			}
+			if (E >= 4.0f && State->Step < 4.0f)
+			{
+				State->Step = 4.0f;
+				const float Back = FVector::Dist(State->Start, GetActorLocation());
+				State->bResetReturned = Back < 100.0f;
+				UE_LOG(LogTemp, Log, TEXT("GigLine QA: reset returned %.0f cm from spawn -> %s"),
+					Back, State->bResetReturned ? TEXT("PASS") : TEXT("FAIL"));
+			}
+
+			// 4.5: pause, then confirm the world actually stopped.
+			if (E >= 4.5f && State->Step < 5.0f)
+			{
+				State->Step = 5.0f;
+				TogglePause();
+				State->bPausedOn = UGameplayStatics::IsGamePaused(this);
+				UE_LOG(LogTemp, Log, TEXT("GigLine QA: pause -> paused=%d %s"),
+					State->bPausedOn ? 1 : 0, State->bPausedOn ? TEXT("PASS") : TEXT("FAIL"));
+			}
+
+			// 5.5: unpause and confirm it comes back.
+			if (E >= 5.5f && State->Step < 6.0f)
+			{
+				State->Step = 6.0f;
+				TogglePause();
+				State->bUnpausedBack = !UGameplayStatics::IsGamePaused(this);
+				UE_LOG(LogTemp, Log, TEXT("GigLine QA: unpause -> paused=%d %s"),
+					UGameplayStatics::IsGamePaused(this) ? 1 : 0,
+					State->bUnpausedBack ? TEXT("PASS") : TEXT("FAIL"));
+			}
+
+			// 6.0: ground transect - sweep both sidewalks and the carriageway and
+			// count holes, so "can traverse the block without falling through"
+			// is measured rather than assumed.
+			if (E >= 6.0f && State->Step < 7.0f)
+			{
+				State->Step = 7.0f;
+				UWorld* W = GetWorld();
+				int32 Holes = 0, Samples = 0;
+				float Lowest = 1.0e9f, Highest = -1.0e9f;
+				static const float Lanes[] = {-1400.0f, -167.0f, 1000.0f}; // N walk, road, S walk
+				for (float LaneY : Lanes)
+				{
+					for (float X = -14900.0f; X <= -9420.0f; X += 200.0f)
+					{
+						FHitResult Hit;
+						FCollisionQueryParams Q(TEXT("GigLineTransect"), false, this);
+						const bool bHit = W->LineTraceSingleByChannel(Hit,
+							FVector(X, LaneY, 3000.f), FVector(X, LaneY, -3000.f),
+							ECC_Visibility, Q);
+						++Samples;
+						if (!bHit)
+						{
+							++Holes;
+							continue;
+						}
+						Lowest = FMath::Min(Lowest, Hit.ImpactPoint.Z);
+						Highest = FMath::Max(Highest, Hit.ImpactPoint.Z);
+					}
+				}
+				UE_LOG(LogTemp, Log,
+					TEXT("GigLine QA: transect %d samples, %d holes, ground Z %.0f..%.0f -> %s"),
+					Samples, Holes, Lowest, Highest, Holes == 0 ? TEXT("PASS") : TEXT("FAIL"));
+			}
+
+			// 7.0: verdict, then stop ticking.
+			if (E >= 7.0f)
+			{
+				const bool bAllPass = State->bWalkMoved && State->bResetReturned
+					&& State->bPausedOn && State->bUnpausedBack;
+				UE_LOG(LogTemp, Log, TEXT("GigLine QA: RESULT walk=%d reset=%d pause=%d unpause=%d -> %s"),
+					State->bWalkMoved ? 1 : 0, State->bResetReturned ? 1 : 0,
+					State->bPausedOn ? 1 : 0, State->bUnpausedBack ? 1 : 0,
+					bAllPass ? TEXT("PASS") : TEXT("FAIL"));
+				return false;
+			}
+			return true;
+		}));
+}
+
 void AGigLineCharacter::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent)
 {
 	Super::SetupPlayerInputComponent(PlayerInputComponent);
@@ -108,6 +357,10 @@ void AGigLineCharacter::SetupPlayerInputComponent(UInputComponent* PlayerInputCo
 		return;
 	}
 
+	// Push the mapping context for this controller's local player so the bound
+	// actions receive input (runs at possession, when the controller exists).
+	LoadInputAssets();
+
 	// One action per direction keeps the sign explicit: W and S differ only by
 	// which handler runs, not by a modifier in the asset.
 	if (MoveAction)
@@ -143,6 +396,12 @@ void AGigLineCharacter::SetupPlayerInputComponent(UInputComponent* PlayerInputCo
 		Input->BindAction(JumpAction, ETriggerEvent::Started, this, &AGigLineCharacter::StartJump);
 		Input->BindAction(JumpAction, ETriggerEvent::Completed, this, &AGigLineCharacter::StopJump);
 	}
+	UE_LOG(LogTemp, Log, TEXT("GigLine IN: bound %d actions; ctx=%s move=%s look=%s jmp=%s"),
+		(Input ? 1 : 0),
+		MappingContext ? TEXT("ok") : TEXT("nil"),
+		MoveAction ? TEXT("ok") : TEXT("nil"),
+		LookAction ? TEXT("ok") : TEXT("nil"),
+		JumpAction ? TEXT("ok") : TEXT("nil"));
 }
 
 namespace
@@ -169,6 +428,8 @@ namespace
 
 void AGigLineCharacter::MoveForward(const FInputActionValue& Value)
 {
+	UE_LOG(LogTemp, Log, TEXT("GigLine IN: MoveForward fired, axis=%.3f type=%d"),
+		FMath::Abs(SignedAxis(Value, false)), (int)Value.GetValueType());
 	ApplyMove(FMath::Abs(SignedAxis(Value, false)), 0.0f);
 }
 
@@ -190,11 +451,16 @@ void AGigLineCharacter::MoveLeft(const FInputActionValue& Value)
 void AGigLineCharacter::ApplyMove(float Forward, float Strafe)
 {
 	const AController* Controller = GetController();
-	if (!Controller || (FMath::IsNearlyZero(Forward) && FMath::IsNearlyZero(Strafe)))
+	if (!Controller)
+	{
+		UE_LOG(LogTemp, Log, TEXT("GigLine IN: ApplyMove called but NO controller (fwd %.2f strafe %.2f)"),
+			Forward, Strafe);
+		return;
+	}
+	if (FMath::IsNearlyZero(Forward) && FMath::IsNearlyZero(Strafe))
 	{
 		return;
 	}
-
 	// Forward/right on the controller yaw keeps the capsule upright on slopes.
 	const FRotator YawRotation(0.0f, Controller->GetControlRotation().Yaw, 0.0f);
 	const FVector ForwardDir = FRotationMatrix(YawRotation).GetUnitAxis(EAxis::X);
@@ -202,6 +468,8 @@ void AGigLineCharacter::ApplyMove(float Forward, float Strafe)
 
 	AddMovementInput(ForwardDir, Forward);
 	AddMovementInput(RightDir, Strafe);
+	UE_LOG(LogTemp, Log, TEXT("GigLine IN: ApplyMove fwd %.2f strafe %.2f controller=%s yaw=%.0f"),
+		Forward, Strafe, *Controller->GetName(), Controller->GetControlRotation().Yaw);
 }
 
 void AGigLineCharacter::Look(const FInputActionValue& Value)

Game/GigLine/Source/GigLine/GigLineCharacter.h

@@ -38,6 +38,22 @@ protected:
 	void ResetToStart();
 	void TogglePause();
 
+	/**
+	 * TEMP QA: scripted walk / reset / pause verification.
+	 *
+	 * Enabled only by the `-qaselftest` command-line switch, so it never runs in
+	 * normal play. It exists because those three behaviours were listed as
+	 * "needs a human at the keyboard" and a repeatable headless check beats
+	 * waiting for one.
+	 */
+	void StartQASelfTest();
+
+	/** Set while the self-test is driving forward input. */
+	bool bQATestWalking = false;
+
+	/** Repeating timer that captures StartLocation on first ground contact. */
+	FTimerHandle SettleHandle;
+
 	/** Where the player started, so reset returns there rather than the origin. */
 	UPROPERTY()
 	FVector StartLocation = FVector::ZeroVector;

Game/GigLine/Source/GigLine/GigLineGameModeBase.cpp

@@ -1,5 +1,6 @@
 #include "GigLineGameModeBase.h"
 
+#include "GameFramework/PlayerController.h"
 #include "GigLineCharacter.h"
 #include "GigLineHUD.h"
 
@@ -9,3 +10,12 @@ AGigLineGameModeBase::AGigLineGameModeBase()
 	// ODbL attribution must be visible in the running demo, not only in docs.
 	HUDClass = AGigLineHUD::StaticClass();
 }
+
+void AGigLineGameModeBase::HandleStartingNewPlayer_Implementation(APlayerController* NewPlayer)
+{
+	Super::HandleStartingNewPlayer_Implementation(NewPlayer);
+	UE_LOG(LogTemp, Log, TEXT("GigLine GM: player %s connected; pawn=%s input=%s"),
+		NewPlayer ? *NewPlayer->GetName() : TEXT("null"),
+		NewPlayer && NewPlayer->GetPawn() ? *NewPlayer->GetPawn()->GetName() : TEXT("NONE"),
+		NewPlayer && NewPlayer->PlayerInput ? TEXT("yes") : TEXT("no"));
+}

Game/GigLine/Source/GigLine/GigLineGameModeBase.h

@@ -18,4 +18,8 @@ class GIGLINE_API AGigLineGameModeBase : public AGameModeBase
 
 public:
 	AGigLineGameModeBase();
+
+protected:
+	/** Logs whether a local player connected to a pawn with input (QA). */
+	virtual void HandleStartingNewPlayer_Implementation(class APlayerController* NewPlayer) override;
 };