Revert token substitution in OPENCODE_CONFIG_CONTENT

Improvements

• CoreEnsure @-mentioning a directory uses the read tool instead of deprecated list tool
• CoreAdd tool.definition hook for plugins to modify tool description and parameters@spoons-and-mirrors
• CoreRemove worktree delete functionality
• CoreResolve ACP hanging indefinitely in thinking state on Windows@ASidorenkoCode
• DesktopReconnect event stream on disconnect
• DesktopToggle all provider models in settings
• DesktopClean up desktop loading page@Brendonovich
• DesktopNotification should navigate to session
• DesktopFix prompt input behavior quirks
• DesktopFailed to create store in app
• DesktopOnly show loading window if SQLite migration is necessary@Brendonovich