Added new shaders

shaders/lift-gamma-gain/shader.json

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+{
+  "id": "lift-gamma-gain",
+  "name": "Lift Gamma Gain",
+  "description": "Basic color grading controls for shadows, midtones, highlights, and overall RGB offset.",
+  "category": "Color",
+  "entryPoint": "shadeVideo",
+  "parameters": [
+    {
+      "id": "lift",
+      "label": "Lift",
+      "type": "color",
+      "default": [0.5, 0.5, 0.5, 1.0]
+    },
+    {
+      "id": "gamma",
+      "label": "Gamma",
+      "type": "color",
+      "default": [0.5, 0.5, 0.5, 1.0]
+    },
+    {
+      "id": "gain",
+      "label": "Gain",
+      "type": "color",
+      "default": [0.5, 0.5, 0.5, 1.0]
+    },
+    {
+      "id": "offset",
+      "label": "Offset",
+      "type": "color",
+      "default": [0.5, 0.5, 0.5, 1.0]
+    },
+    {
+      "id": "strength",
+      "label": "Strength",
+      "type": "float",
+      "default": 1.0,
+      "min": 0.0,
+      "max": 1.0,
+      "step": 0.01
+    }
+  ]
+}

shaders/lift-gamma-gain/shader.slang

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+float3 applyLiftGammaGainOffset(float3 color)
+{
+	float3 liftAdjust = (lift.rgb - 0.5) * 0.5;
+	float3 offsetAdjust = (offset.rgb - 0.5) * 0.5;
+	float3 gammaAdjust = exp2((gamma.rgb - 0.5) * 2.0);
+	float3 gainAdjust = exp2((gain.rgb - 0.5) * 2.0);
+
+	float3 lifted = color + liftAdjust;
+	float3 gained = lifted * gainAdjust;
+	float3 corrected = pow(saturate(gained), 1.0 / max(gammaAdjust, float3(0.001)));
+	return corrected + offsetAdjust;
+}
+
+float4 shadeVideo(ShaderContext context)
+{
+	float4 source = context.sourceColor;
+	float3 graded = applyLiftGammaGainOffset(source.rgb);
+	source.rgb = lerp(source.rgb, graded, strength);
+	return saturate(source);
+}