Initial release — InstaShadow mastering compressor v1.0

Dual-stage compressor (optical + VCA) with output transformer saturation.
- Port-Hamiltonian T4B opto-cell model with implicit trapezoidal integration
- Feed-forward VCA with 7 ratios, 6 attack/release presets, Dual release mode
- 3 transformer types (Nickel/Iron/Steel) with 4x oversampled waveshaping
- Analog-style needle VU meters, horizontal GR meters
- Sidechain HPF, stereo link, independent section bypass
- Full state save/restore, CI/CD for Windows/macOS/Linux

Source/OutputPanel.cpp

@@ -0,0 +1,52 @@
+#include "OutputPanel.h"
+
+OutputPanel::OutputPanel()
+{
+    titleLabel.setText ("OUTPUT", juce::dontSendNotification);
+    titleLabel.setJustificationType (juce::Justification::centredLeft);
+    titleLabel.setColour (juce::Label::textColourId, InstaShadowLookAndFeel::textPrimary);
+    addAndMakeVisible (titleLabel);
+
+    outputGainKnob.setSliderStyle (juce::Slider::RotaryHorizontalVerticalDrag);
+    outputGainKnob.setTextBoxStyle (juce::Slider::TextBoxBelow, false, 60, 14);
+    outputGainKnob.setRange (-12.0, 12.0);
+    outputGainKnob.setValue (0.0);
+    outputGainKnob.setTextValueSuffix (" dB");
+    outputGainKnob.getProperties().set (InstaShadowLookAndFeel::knobTypeProperty, "orange");
+    addAndMakeVisible (outputGainKnob);
+
+    gainLabel.setText ("Gain", juce::dontSendNotification);
+    gainLabel.setJustificationType (juce::Justification::centred);
+    gainLabel.setColour (juce::Label::textColourId, InstaShadowLookAndFeel::textSecondary);
+    addAndMakeVisible (gainLabel);
+
+    addAndMakeVisible (vuMeter);
+}
+
+void OutputPanel::resized()
+{
+    auto bounds = getLocalBounds().reduced (4);
+    titleLabel.setBounds (bounds.removeFromTop (20));
+
+    int halfW = bounds.getWidth() / 2;
+
+    auto knobArea = bounds.removeFromLeft (halfW);
+    auto knobRect = knobArea.withTrimmedBottom (16);
+    outputGainKnob.setBounds (knobRect.reduced (2));
+    gainLabel.setBounds (knobArea.getX(), knobRect.getBottom() - 2, knobArea.getWidth(), 16);
+
+    // Small VU meter, limited height
+    auto vuArea = bounds.reduced (8, 4);
+    int maxVuH = std::min (vuArea.getHeight(), (int) (knobRect.getHeight() * 0.6f));
+    int maxVuW = std::min (vuArea.getWidth(), 40);
+    vuMeter.setBounds (vuArea.withSizeKeepingCentre (maxVuW, maxVuH));
+}
+
+void OutputPanel::paint (juce::Graphics& g)
+{
+    auto bounds = getLocalBounds().toFloat();
+    g.setColour (InstaShadowLookAndFeel::bgMedium.withAlpha (0.5f));
+    g.fillRoundedRectangle (bounds, 4.0f);
+    g.setColour (InstaShadowLookAndFeel::bgLight.withAlpha (0.3f));
+    g.drawRoundedRectangle (bounds, 4.0f, 1.0f);
+}