ElfDeckAI 1.1.0

Added

• mouse_click_at and mouse_move_to MCP tools: click or point at (x, y)
  in the pixels of the most recent screenshot. Backed by a new absolute
  pointer device, "ElfMouse Absolute", and the ElfMouse command
  moveto <x> <y> [<width> <height>].
• Screenshots larger than 1280 px on their long side are scaled down
  before sending (ELFDECKAI_SCREENSHOT_MAX sets the limit; 0 disables).
  The screenshot result now also states the image size.
• Steam Deck Gaming Mode screenshots, through gamescope's gamescopectl.
  Used first whenever gamescope is running; the Desktop Mode tools remain
  the fallback.
• ROADMAP.md, and scripts/probe-gaming-mode.sh for checking Gaming Mode
  support on a Deck.

Changed

• Screenshots are captured as uncompressed PPM where the capture tool
  supports it, falling back to PNG.
• The installer also checks for the ElfMouse Absolute device.
• The server re-reads the graphical session's variables before every
  screenshot, so switching between Desktop Mode and Gaming Mode no longer
  needs a server restart.