CLI v0.249.0, Desktop v0.206.0: Resumable update downloads, faster session opening, plugin MCP counts, and CLI and app fixes

Improvements - Session opening speed - Opening a session is now faster on machines that hold many project folders - Suggestion menu responsiveness - The slash and mention menus now respond faster as you move through their entries - Slack channel context notice - Droid now says it sees only the opening message in a Slack channel it did not create Bug fixes - Spec folder in settings - Settings now shows the folder specs save to, and a Default row keeps it unset - Update checks after sign-in - Droid now checks for an update after you sign in instead of skipping it for that run - Startup draft slash menu - A slash command typed while Droid starts now opens its menu without another keypress - Resumable update downloads - An update download interrupted by a dropped connection now resumes instead of failing - Plugin MCP server count - The startup header now counts MCP servers that come from plugins