v0.10.10: fix AU cold open failure on older macOS (issue #13)

Set CMAKE_OSX_DEPLOYMENT_TARGET=10.13 in CMakeLists.txt and CI workflow
so AU/VST3 binaries load on macOS High Sierra+. Add ad-hoc codesigning
for macOS CI builds. Replace std::bit_cast with portable FloatBits union
for older libc++ compatibility. Guard file I/O in editor for sandboxed
AU environments.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: tucktuckg00se

.github/workflows/release.yml

@@ -84,11 +84,17 @@ jobs:
         run: echo "PLUGIN_VERSION=$(echo '${{ github.ref_name }}' | sed 's/^v//')" >> $GITHUB_ENV
 
       - name: Configure
-        run: cmake -B build -DCMAKE_BUILD_TYPE=Release -DINTERSECT_VERSION=${{ env.PLUGIN_VERSION }}
+        run: cmake -B build -DCMAKE_BUILD_TYPE=Release -DCMAKE_OSX_DEPLOYMENT_TARGET=10.13 -DINTERSECT_VERSION=${{ env.PLUGIN_VERSION }}
 
       - name: Build
         run: cmake --build build --config Release
 
+      - name: Codesign
+        run: |
+          codesign --force --deep --sign - build/Intersect_artefacts/Release/AU/INTERSECT.component
+          codesign --force --deep --sign - build/Intersect_artefacts/Release/VST3/INTERSECT.vst3
+          codesign --force --deep --sign - build/Intersect_artefacts/Release/Standalone/INTERSECT.app
+
       - name: Package
         run: |
           mkdir staging
@@ -114,11 +120,17 @@ jobs:
         run: echo "PLUGIN_VERSION=$(echo '${{ github.ref_name }}' | sed 's/^v//')" >> $GITHUB_ENV
 
       - name: Configure
-        run: cmake -B build -DCMAKE_BUILD_TYPE=Release -DINTERSECT_VERSION=${{ env.PLUGIN_VERSION }}
+        run: cmake -B build -DCMAKE_BUILD_TYPE=Release -DCMAKE_OSX_DEPLOYMENT_TARGET=10.13 -DINTERSECT_VERSION=${{ env.PLUGIN_VERSION }}
 
       - name: Build
         run: cmake --build build --config Release
 
+      - name: Codesign
+        run: |
+          codesign --force --deep --sign - build/Intersect_artefacts/Release/AU/INTERSECT.component
+          codesign --force --deep --sign - build/Intersect_artefacts/Release/VST3/INTERSECT.vst3
+          codesign --force --deep --sign - build/Intersect_artefacts/Release/Standalone/INTERSECT.app
+
       - name: Package
         run: |
           mkdir staging

CMakeLists.txt

@@ -1,4 +1,9 @@
 cmake_minimum_required(VERSION 3.22)
+
+if(APPLE)
+    set(CMAKE_OSX_DEPLOYMENT_TARGET "10.13" CACHE STRING "Minimum macOS version")
+endif()
+
 set(INTERSECT_VERSION "" CACHE STRING "Plugin version (injected by CI, or auto-detected from git tag)")
 if(INTERSECT_VERSION STREQUAL "")
     find_package(Git QUIET)

src/PluginEditor.cpp

@@ -334,7 +334,8 @@ void IntersectEditor::timerCallback()
 void IntersectEditor::ensureDefaultThemes()
 {
     auto dir = getThemesDir();
-    dir.createDirectory();
+    if (! dir.createDirectory())
+        return;  // sandboxed or read-only — fall back to in-memory defaults
 
     auto darkFile = dir.getChildFile ("dark.intersectstyle");
     auto darkText = ThemeData::darkTheme().toThemeFile();
@@ -403,7 +404,8 @@ void IntersectEditor::applyTheme (const juce::String& themeName)
 void IntersectEditor::saveUserSettings (float scale, const juce::String& themeName)
 {
     auto file = getUserSettingsFile();
-    file.getParentDirectory().createDirectory();
+    if (! file.getParentDirectory().createDirectory())
+        return;  // sandboxed or read-only — skip silently
     juce::String content;
     content << "uiScale: " << juce::String (scale, 2) << "\n";
     content << "theme: " << themeName << "\n";

src/PluginProcessor.cpp

@@ -3,8 +3,8 @@
 #include "Constants.h"
 #include "audio/GrainEngine.h"
 #include "audio/AudioAnalysis.h"
-#include <bit>
 #include <cmath>
+#include <cstring>
 #include <functional>
 #include <memory>
 
@@ -186,16 +186,22 @@ constexpr float kMidiEditZoomClampMax = 16384.0f;
 constexpr double kMidiEditZoomStepsPerOctave = 6.0;
 constexpr double kMidiEditGestureIdleSeconds = 0.3;
 
+union FloatBits { float f; uint32_t u; };
+
 uint64_t packPendingSliceParamPayload (int field, float value)
 {
+    FloatBits fb;
+    fb.f = value;
     return (uint64_t) (uint32_t) field << 32
-        | (uint64_t) std::bit_cast<uint32_t> (value);
+        | (uint64_t) fb.u;
 }
 
 void unpackPendingSliceParamPayload (uint64_t payload, int& field, float& value)
 {
     field = (int) (payload >> 32);
-    value = std::bit_cast<float> ((uint32_t) (payload & 0xFFFFFFFFu));
+    FloatBits fb;
+    fb.u = (uint32_t) (payload & 0xFFFFFFFFu);
+    value = fb.f;
 }
 
 PreviewStretchParams makePreviewStretchParams (const GlobalParamSnapshot& globals,