qa: package + document controls (0.1.0 release check PASS)

- Docs/controls.md: full binding table + headless input-test note.
- AGigLineHUD: draw a control legend bottom-right every frame
  (WASD move / Mouse look / Space jump / R reset / Esc pause).
- Verified on the packaged Development build: launches straight into DemoMap, no
  missing-asset or linker errors; controls text confirmed in the capture
  (bottom-right bbox 426x12 px). Evidence in Docs/release-checks.md +
  Docs/perf/0.1.0-packaged-hud-controls.png.

Game/GigLine/Source/GigLine/GigLineHUD.cpp

@@ -26,4 +26,15 @@ void AGigLineHUD::DrawHUD()
 
 	DrawText(AttributionLine, Ink, X, Y, nullptr, TextScale);
 	DrawText(LicenceLine, Ink, X, Y + LineHeight, nullptr, TextScale * 0.82f);
+
+	// Control legend, bottom-right (0.1.0 release check: controls shown in-game).
+	if (!ControlsLine.IsEmpty())
+	{
+		float IgnoredW = 0.0f, ControlsH = 0.0f;
+		GetTextSize(ControlsLine, IgnoredW, ControlsH, nullptr, TextScale * 0.82f);
+		const float CX = Canvas->ClipX - MarginPx - IgnoredW;
+		const float CY = Canvas->ClipY - MarginPx - ControlsH;
+		DrawText(ControlsLine, Shadow, CX + 1.0f, CY + 1.0f, nullptr, TextScale * 0.82f);
+		DrawText(ControlsLine, Ink, CX, CY, nullptr, TextScale * 0.82f);
+	}
 }

Game/GigLine/Source/GigLine/GigLineHUD.h

@@ -28,6 +28,14 @@ public:
 	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Attribution")
 	FString AttributionLine = TEXT("\u00A9 OpenStreetMap contributors");
 
+	/**
+	 * Control legend, shown bottom-right so the 0.1.0 demo documents its own
+	 * controls in-game (release check: "controls documented in Docs/ and shown
+	 * in-game"). Keep in sync with Docs/controls.md.
+	 */
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Controls")
+	FString ControlsLine = TEXT("WASD move  \u00B7  Mouse look  \u00B7  Space jump  \u00B7  R reset  \u00B7  Esc pause");
+
 	/** Licence line, including where the licence can be read. */
 	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Attribution")
 	FString LicenceLine = TEXT("Data \u00A9 OpenStreetMap contributors, ODbL 1.0 \u2014 openstreetmap.org/copyright");