Prevent memory leaks from AbortController closures

Improvements

• CoreRevert addition of Trinity model system prompt support
• CoreAdd Trinity model system prompt support@mariamjabara
• CoreAdd shell.env hook for manipulating environment in tools and shell@tylergannon
• CoreUse official ai-gateway-provider package for Cloudflare AI Gateway@elithrar
• CoreAllow theme colors in agent customization@IdrisGit
• CoreAdd support for reading skills from .agents/skills directories
• CoreProvider headers from config not applied to fetch requests@cloudyan
• CoreEnsure MCP tools are sanitized
• CoreAdd .slnx to C#/F# LSP root detection@workedbeforepush
• CoreImprove skills system with better prompting, fix permission requests after skill invocation, and ensure agents can locate scripts and resources
• CoreExclude k2p5 from reasoning variants@neavo
• CoreHandle nested array items for Gemini schema validation@mugnimaestra
• CorePlugins are always reinstalled@neriousy
• CoreStrip properties and required fields from non-object types in Gemini schema@ChickenBreast-ky
• CoreMake CLI run command non-interactive
• TerminalAdd --thinking flag to show reasoning blocks in run command
• TerminalAlways fall back to native clipboard after OSC52@MartinWie
• DesktopFaster end-to-end tests@neriousy
• DesktopUpdate command palette placeholder text
• DesktopModel selector truncating too soon
• DesktopImprove spacing in application UI
• DesktopAllow empty prompt with review comments in desktop@dbpolito
• DesktopFixed terminal serialization bug in app
• DesktopDon't force mount tooltips in the app
• DesktopRestore previously opened session tabs on app restart@ProdigyRahul
• DesktopEdit project dialog icon now shows on hover@ProdigyRahul
• DesktopMove session search to command palette
• DesktopFix custom providers overflow in app@DNGriffin