Initial commit: InstaDrums VST3 drum sampler plugin

- 12-pad drum sampler with 4x3 grid (expandable by 4)
- Velocity layers with round-robin (Salamander-style filename parsing)
- Rhythm Engine-style GUI: pad grid (left), sample editor (right top),
  FX panel (right bottom), master panel (bottom)
- Waveform thumbnails on pads + large waveform in sample editor
- ADSR envelope, pitch, pan per pad
- Drag & drop sample/folder loading
- Kit save/load (.drumkit XML presets)
- Load Folder with smart name matching (kick, snare, hihat, etc.)
- Choke groups, one-shot/polyphonic mode
- Dark modern LookAndFeel with neon accent colors
- Built with JUCE framework, CMake, MSVC 2022

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Source/PluginProcessor.h

@@ -0,0 +1,60 @@
+#pragma once
+#include <JuceHeader.h>
+#include "DrumPad.h"
+
+class InstaDrumsProcessor : public juce::AudioProcessor
+{
+public:
+    static constexpr int defaultNumPads = 12;
+    static constexpr int maxPads = 64;
+
+    InstaDrumsProcessor();
+    ~InstaDrumsProcessor() override;
+
+    void prepareToPlay (double sampleRate, int samplesPerBlock) override;
+    void releaseResources() override;
+    void processBlock (juce::AudioBuffer<float>&, juce::MidiBuffer&) override;
+
+    juce::AudioProcessorEditor* createEditor() override;
+    bool hasEditor() const override { return true; }
+
+    const juce::String getName() const override { return JucePlugin_Name; }
+    bool acceptsMidi() const override { return true; }
+    bool producesMidi() const override { return true; }
+    double getTailLengthSeconds() const override { return 0.0; }
+
+    int getNumPrograms() override { return 1; }
+    int getCurrentProgram() override { return 0; }
+    void setCurrentProgram (int) override {}
+    const juce::String getProgramName (int) override { return {}; }
+    void changeProgramName (int, const juce::String&) override {}
+
+    void getStateInformation (juce::MemoryBlock& destData) override;
+    void setStateInformation (const void* data, int sizeInBytes) override;
+
+    // Pad management
+    int getNumPads() const { return numActivePads; }
+    DrumPad& getPad (int index) { return pads[index]; }
+    void addPads (int count = 4);
+    void loadSample (int padIndex, const juce::File& file);
+
+    juce::AudioFormatManager& getFormatManager() { return formatManager; }
+
+    // Find pad by MIDI note
+    DrumPad* findPadForNote (int midiNote);
+
+    // Kit management
+    void loadKitFromFolder (const juce::File& folder);
+    void saveKitPreset (const juce::File& file);
+    void loadKitPreset (const juce::File& file);
+
+private:
+    std::array<DrumPad, maxPads> pads;
+    int numActivePads = defaultNumPads;
+    juce::AudioFormatManager formatManager;
+
+    // Default MIDI mapping (GM drum map)
+    void initializeDefaults();
+
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (InstaDrumsProcessor)
+};