qa(diag): gate spawn/input setup logs behind gigline.SetupLogs cvar (default off)

TODO item: remove/gate the TEMP QA diagnostics. The GigLine SIM/GROUND probes
were already removed (PR #8); what remained was the settle-timer log and the
GigLine IN: input-setup logs. Now gated behind a TAutoConsoleVariable
(gigline.SetupLogs, default 0 in DefaultEngine.ini [ConsoleVariables]), so a
shipped build's log has no setup spam; re-enable at runtime with
'gigline.SetupLogs 1'. The -qaselftest QA logs are a deliberate release-check
feature (Docs/release-checks.md) and stay ungated. Verified on the packaged
build: 0 setup-log lines, QA suite still all PASS.

Game/GigLine/Config/DefaultEngine.ini

@@ -15,6 +15,11 @@ TransitionMap=/Game/Hollywood/DemoMap
 ; static lighting outright — nothing to build, no warning.
 r.AllowStaticLighting=False
 
+[ConsoleVariables]
+; Dev diagnostics (spawn/input setup logs) are off by default in shipped builds.
+; Re-enable at runtime: `gigline.SetupLogs 1`.
+gigline.SetupLogs=0
+
 [URL]
 GameName=GigLine
 

Game/GigLine/Source/GigLine/GigLineCharacter.cpp

@@ -15,6 +15,14 @@
 #include "Misc/CommandLine.h"
 #include "Misc/Parse.h"
 
+// Development-only diagnostics for the walkable demo. These describe the spawn
+// and input setup and are not needed in a shipped build's log spam; disable
+// with `-NoGigLineSetupLogs` (or set the cvar in release config).
+static TAutoConsoleVariable<int32> CVarGigLineSetupLogs(
+	TEXT("gigline.SetupLogs"),
+	1,
+	TEXT("Log GigLine spawn/input setup diagnostics (0=off, 1=on)."));
+
 AGigLineCharacter::AGigLineCharacter()
 {
 	PrimaryActorTick.bCanEverTick = false;
@@ -102,15 +110,18 @@ void AGigLineCharacter::LoadInputAssets()
 					ULocalPlayer::GetSubsystem<UEnhancedInputLocalPlayerSubsystem>(PC->GetLocalPlayer()))
 			{
 				Subsystem->AddMappingContext(MappingContext, 0);
-				UE_LOG(LogTemp, Log, TEXT("GigLine IN: pushed mapping context %s"),
-					*MappingContext->GetName());
+				if (CVarGigLineSetupLogs.GetValueOnGameThread())
+				{
+					UE_LOG(LogTemp, Log, TEXT("GigLine IN: pushed mapping context %s"),
+						*MappingContext->GetName());
+				}
 			}
-			else
+			else if (CVarGigLineSetupLogs.GetValueOnGameThread())
 			{
 				UE_LOG(LogTemp, Log, TEXT("GigLine IN: no enhanced input subsystem on local player"));
 			}
 		}
-		else
+		else if (CVarGigLineSetupLogs.GetValueOnGameThread())
 		{
 			UE_LOG(LogTemp, Log, TEXT("GigLine IN: no PlayerController at LoadInputAssets"));
 		}
@@ -143,8 +154,11 @@ void AGigLineCharacter::BeginPlay()
 				StartLocation = GetActorLocation();
 				StartRotation = GetActorRotation();
 				GetWorldTimerManager().ClearTimer(this->SettleHandle);
-				UE_LOG(LogTemp, Log, TEXT("GigLine: start captured on ground at Z %.0f"),
-					StartLocation.Z);
+				if (CVarGigLineSetupLogs.GetValueOnGameThread())
+				{
+					UE_LOG(LogTemp, Log, TEXT("GigLine: start captured on ground at Z %.0f"),
+						StartLocation.Z);
+				}
 			}
 		}
 	}, 0.25f, true);
@@ -410,12 +424,15 @@ 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"));
+	if (CVarGigLineSetupLogs.GetValueOnGameThread())
+	{
+		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