Sprint 6: add channelName + setChannelName to Processor header

fix: restore v0.5.2 architecture + wire AudioAnalyser correctly

integrate AudioAnalyser into Processor + wire get_analysis in McpServer

Upload Source/Plugin/PluginBridgeProcessor.h

fix: add TestResult enum to header (was in .cpp but missing from .h)

NEW ARCHITECTURE: In-process hosting + Helper as safety tester + embedded GUI

Fix: Add hidePluginGui() method to Processor

Fix: Add getLastPluginPath() so reload works after crash, fix Editor reload button

Out-of-process rebuild: Add Plugin/PluginBridgeProcessor.h/.cpp — uses HelperConnection for crash-safe hosting