npc: AGigLineNPCPerson prefab + stable-named screenshots

- New C++ AGigLineNPCPerson: reusable NPC/pedestrian prefab built on the MPFB
  human. ACharacter capsule half-height 83 cm (total 1.66 m, head top ~1.66 m
  so a 1.60 m camera doesn't clip), the character skeletal mesh on the built-in
  mesh as the visible body (feet on Z 0), AutoPossessAI for 0.5.0 pedestrians.
  Staged at Z 0 in the review scene; captured as review-npc-prefab.png.
- AGigLineShotActor now names screenshots by stable camera name (no list-index
  prefix): inserting or reordering cameras no longer renumbers files or orphans
  the old ones. Re-rendered all review/demo shots with stable names.
- ue_build_review_map.py: chmod the target .umap before save_map (git marks maps
  444 on checkout, silently making save_map return False and dropping stages).
- Screenshots/README.md, ROADMAP, TODO updated for the prefab + stable names.
- DemoMap.umap rebuilt by the render pipeline (north buildings + demo cameras).

Game/GigLine/Source/GigLine/GigLineNPCPerson.cpp

@@ -0,0 +1,34 @@
+#include "GigLineNPCPerson.h"
+
+#include "Components/CapsuleComponent.h"
+#include "Components/SkeletalMeshComponent.h"
+#include "Engine/SkeletalMesh.h"
+
+AGigLineNPCPerson::AGigLineNPCPerson()
+{
+	// The MPFB human is ~1.66 m tall, ~0.43 m wide. Half-height 83 cm leaves
+	// the head top at ~1.66 m, so a 1.60 m camera does not clip it. Radius
+	// ~35 cm accommodates the relaxed idle pose (arms at the sides).
+	GetCapsuleComponent()->InitCapsuleSize(35.0f, 83.0f);
+	GetCapsuleComponent()->SetRelativeLocation(FVector(0.0f, 0.0f, 83.0f));
+
+	// Visible body: the imported MPFB human on ACharacter's built-in mesh
+	// component, feet at Z 0 (capsule base lowered to the floor).
+	USkeletalMeshComponent* Mesh = GetMesh();
+	Mesh->SetRelativeLocation(FVector(0.0f, 0.0f, -83.0f));
+	Mesh->SetRelativeRotation(FRotator(0.0f, -90.0f, 0.0f));
+	Mesh->SetCastShadow(true);
+
+	static ConstructorHelpers::FObjectFinder<USkeletalMesh> MeshAsset(
+		TEXT("/Game/Test/Character/character"));
+	if (MeshAsset.Succeeded())
+	{
+		Mesh->SetSkeletalMeshAsset(MeshAsset.Object);
+		Mesh->SetSkeletalMesh(MeshAsset.Object);
+	}
+
+	// An NPC pawn has no player input; hand it to AI when it is spawned into
+	// the world (the 0.5.0 pedestrian navigation will drive it).
+	AutoPossessAI = EAutoPossessAI::PlacedInWorldOrSpawned;
+	bUseControllerRotationYaw = false;
+}

Game/GigLine/Source/GigLine/GigLineNPCPerson.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include "CoreMinimal.h"
+#include "GameFramework/Character.h"
+#include "GigLineNPCPerson.generated.h"
+
+/**
+ * Reusable NPC/pedestrian prefab built on the MPFB human asset.
+ *
+ * Deliberately NOT the 0.1.0 player (which is AGigLineCharacter, a capsule +
+ * camera). This is the visible-body template for future NPCs/pedestrians
+ * (0.5.0): ACharacter's collision capsule sized to the ~1.66 m MPFB human,
+ * with the character skeletal mesh on the built-in mesh component as the
+ * visible body, feet at Z 0.
+ *
+ * Head-height guarantee: capsule half-height 83 cm (total 1.66 m), so the head
+ * top sits at ~1.66 m; a camera/view at 1.60 m sits just below eye level and
+ * does not clip the head or neck. Set HeadHeightCm after observing the posed
+ * mesh if the eye socket lands elsewhere.
+ */
+UCLASS()
+class GIGLINE_API AGigLineNPCPerson : public ACharacter
+{
+	GENERATED_BODY()
+
+public:
+	AGigLineNPCPerson();
+
+	/** Observed head height (cm above Z 0), used to verify camera clearance. */
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "NPC")
+	float HeadHeightCm = 155.f;
+};

Game/GigLine/Source/GigLine/GigLineShotActor.cpp

@@ -27,8 +27,12 @@ void AGigLineShotActor::Tick(float DeltaSeconds)
 		if (SettleCountdown <= 0.f)
 		{
 			bWaitingForSettle = false;
-			const FString FileName = FString::Printf(TEXT("review-%02d-%s"), CurrentShot,
-				CurrentShot < ShotNames.Num() ? *ShotNames[CurrentShot] : *FString::FromInt(CurrentShot));
+			// Use the stable custom name only (no list-index prefix): inserting or
+			// reordering cameras must not renumber files and orphan the old ones.
+			const FString Name = CurrentShot < ShotNames.Num()
+				? ShotNames[CurrentShot]
+				: FString::FromInt(CurrentShot);
+			const FString FileName = FString::Printf(TEXT("review-%s"), *Name);
 			// Resolution is the game window's; the runner passes -ResX/-ResY.
 			FScreenshotRequest::RequestScreenshot(FileName, false, false);
 			bWaitingForScreenshot = true;