v0.12.4

Fixed

• Label atlas crash on large graphs — renderLabelAtlas created textures exceeding Metal's 16384px max dimension when users had many memories with long labels (e.g. height 22774). Atlas now falls back to 1x scale when 2x would overflow, with a hard cap at 16384.
• Label truncation overflow — extractLabel topic-prefix path could produce 50+ character labels (e.g. "visualizer-3d-rendering-core: ...") when topic names were long, wasting atlas row space. Labels now intelligently budget between topic and content, capped at 30 chars total.
• Atlas texture storage mode — changed from .managed to .shared (correct for Apple Silicon unified memory)

Changed

• Sparkle signing — replaced --deep codesign with explicit bottom-up signing of XPC services, fixing App Management TCC prompt on macOS Ventura+