Token substitution in OPENCODE_CONFIG_CONTENT environment variable

Improvements

• CoreLook for recent model in fallback in CLI@smitchaudhary
• CoreBaseline CPU detection fixed@Hona
• CoreWindows selection behavior and manual Ctrl+C handling@Hona
• CoreTerminal PTY isolation for app
• TerminalDo not open console on error
• DesktopOption to turn off sound effects
• DesktopNormalize OAuth error messages
• DesktopSuggestion active state broken
• DesktopFixed remote HTTP server connections in the app
• CoreImprove Codex model list