v1.1.3: Brickwall limiter + double-click reset on all knobs

- Output brickwall limiter (0 dB ceiling) with toggle in master row
- All sliders reset to default on double-click:
  Master gain → 0 dB, Freq → 1000 Hz, Gain → 0 dB, Q → 1.0

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

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.22)
-project(InstaLPEQ VERSION 1.1.2)
+project(InstaLPEQ VERSION 1.1.3)
 
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)