Sprint 1: Add PluginBridgeProcessor.cpp — audio passthrough + MCP server lifecycle

Source/PluginBridgeProcessor.cpp

@@ -0,0 +1,74 @@
+#include "PluginBridgeProcessor.h"
+#include "PluginBridgeEditor.h"
+
+PluginBridgeProcessor::PluginBridgeProcessor()
+    : AudioProcessor(BusesProperties()
+                         .withInput("Input", juce::AudioChannelSet::stereo(), true)
+                         .withOutput("Output", juce::AudioChannelSet::stereo(), true)),
+      mcpServer(kDefaultMcpPort)
+{
+    // Start MCP server in background thread
+    mcpServer.start();
+}
+
+PluginBridgeProcessor::~PluginBridgeProcessor()
+{
+    mcpServer.stop();
+}
+
+void PluginBridgeProcessor::prepareToPlay(double /*sampleRate*/, int /*samplesPerBlock*/)
+{
+    // Phase 2: prepare hosted plugin + analyser here
+}
+
+void PluginBridgeProcessor::releaseResources()
+{
+    // Phase 2: release hosted plugin + analyser here
+}
+
+void PluginBridgeProcessor::processBlock(juce::AudioBuffer<float>& buffer,
+                                          juce::MidiBuffer& /*midiMessages*/)
+{
+    juce::ScopedNoDenormals noDenormals;
+
+    // Clear any extra output channels
+    auto totalNumInputChannels = getTotalNumInputChannels();
+    auto totalNumOutputChannels = getTotalNumOutputChannels();
+    for (auto i = totalNumInputChannels; i < totalNumOutputChannels; ++i)
+        buffer.clear(i, 0, buffer.getNumSamples());
+
+    // Sprint 1: Pure passthrough — audio goes in, audio goes out unchanged
+    // Phase 2: analyser.processBlock(buffer)
+    // Phase 2: hostedPlugin->processBlock(buffer, midi)
+}
+
+juce::AudioProcessorEditor* PluginBridgeProcessor::createEditor()
+{
+    return new PluginBridgeEditor(*this);
+}
+
+void PluginBridgeProcessor::getStateInformation(juce::MemoryBlock& /*destData*/)
+{
+    // Phase 2: save which plugin is loaded + its state
+}
+
+void PluginBridgeProcessor::setStateInformation(const void* /*data*/, int /*sizeInBytes*/)
+{
+    // Phase 2: restore hosted plugin from saved state
+}
+
+bool PluginBridgeProcessor::isMcpServerRunning() const
+{
+    return mcpServer.isRunning();
+}
+
+int PluginBridgeProcessor::getMcpServerPort() const
+{
+    return mcpServer.getPort();
+}
+
+// JUCE plugin entry point
+juce::AudioProcessor* JUCE_CALLTYPE createPluginFilter()
+{
+    return new PluginBridgeProcessor();
+}