v6.0.0

What's Changed

• ci: 7-day artifact retention and MSI-only uploads by @CakeRepository in #2
• System-audio capture for meetings (Windows, Linux, macOS stub) by @CakeRepository in #4
• Dictation in the new desktop app: loop, hotkeys, typing, focus guard, overlay, tray, settings by @CakeRepository in #5
• ONNX speech models on CUDA, plus tray Exit and --quit by @CakeRepository in #7
• Exit always leaves a recording Canceled or Completed by @CakeRepository in #8
• Final pass: one row per speaker turn, in start order by @CakeRepository in #9
• Dictation on Windows: open the microphone, steady overlay, settings that fit by @CakeRepository in #10
• .NET 10, portable core, and cross-platform spikes (stages 1-3) by @CakeRepository in #3

Full Changelog: v5.1.0...v6.0.0