Claude models now served through OpenRouter · desktop tray icon fix · steadier deploys

Models
- All Claude models (Sonnet 4.6, Sonnet 5, Opus 5, Fable 5.1) are now served through a single OpenRouter route, so Claude requests no longer depend on the previous cloud provider path that had started rejecting traffic.
- Fixed a routing entry for Claude Sonnet 4.6 that had been removed by mistake, which could make that model unavailable for a short window.
Desktop App
- Fixed the menu-bar/tray icon so it renders correctly again in both light and dark system themes, instead of showing as blank or mis-scaled.
Reliability
- Deployments are steadier: release builds now size their concurrency to the build machine, stop orphaned builds when a release is cancelled, and raise an alert when the build machine is overloaded.