Refactor user management in Ansible playbooks to standardize on keeper_user

- Updated user addition tasks across multiple playbooks (mcp_switchboard, mcpo, neo4j, neo4j_mcp, openwebui, postgresql, rabbitmq, searxng, smtp4dev) to replace references to ansible_user and remote_user with keeper_user.
- Modified PostgreSQL deployment to create directories and manage files under keeper_user's home.
- Enhanced documentation to clarify account taxonomy and usage of keeper_user in playbooks.
- Introduced new deployment for Agent S, including environment setup, desktop environment installation, XRDP configuration, and accessibility support.
- Added staging playbook for preparing release tarballs from local repositories.
- Created templates for XRDP configuration and environment activation scripts.
- Removed obsolete sunwait documentation.

ansible/agent_s/xorg.conf.j2

@@ -0,0 +1,70 @@
+# XRDP Xorg configuration - Fixed 1024x768 resolution for Agent-S / UI-TARS compatibility
+# Deployed by Ansible to /etc/X11/xrdp/xorg.conf
+
+Section "ServerLayout"
+    Identifier "X11 Server"
+    Screen "Screen (xrdpdev)"
+    InputDevice "xrdpMouse" "CorePointer"
+    InputDevice "xrdpKeyboard" "CoreKeyboard"
+EndSection
+
+Section "ServerFlags"
+    # Prevent other ServerLayout sections from overriding this one
+    Option "DefaultServerLayout" "X11 Server"
+    Option "DontVTSwitch" "on"
+    Option "AutoAddDevices" "off"
+    Option "AutoAddGPU" "off"
+EndSection
+
+Section "Module"
+    Load "dbe"
+    Load "ddc"
+    Load "extmod"
+    Load "glx"
+    Load "int10"
+    Load "record"
+    Load "vbe"
+    Load "glamoregl"
+    Load "xorgxrdp"
+    Load "fb"
+EndSection
+
+Section "InputDevice"
+    Identifier "xrdpKeyboard"
+    Driver "xrdpkeyb"
+EndSection
+
+Section "InputDevice"
+    Identifier "xrdpMouse"
+    Driver "xrdpmouse"
+EndSection
+
+Section "Monitor"
+    Identifier "Monitor"
+    Option "DPMS"
+    HorizSync 30-80
+    VertRefresh 60-75
+    # Fixed resolution for Agent-S / UI-TARS compatibility
+    Modeline "1024x768" 63.50 1024 1072 1176 1328 768 771 775 798 -hsync +vsync
+    # Fallback resolutions required by xrdpdev driver
+    Modeline "800x600" 38.25 800 832 912 1024 600 603 607 624 -hsync +vsync
+    Modeline "640x480" 23.75 640 664 720 800 480 483 487 500 -hsync +vsync
+EndSection
+
+Section "Device"
+    Identifier "Video Card (xrdpdev)"
+    Driver "xrdpdev"
+EndSection
+
+Section "Screen"
+    Identifier "Screen (xrdpdev)"
+    Device "Video Card (xrdpdev)"
+    Monitor "Monitor"
+    DefaultDepth 24
+    SubSection "Display"
+        Depth 24
+        # Fixed resolution - 1024x768 with fallbacks for xrdpdev driver
+        Modes "1024x768" "800x600" "640x480"
+        Virtual 1024 768
+    EndSubSection
+EndSection