Opt-in logical seats for concurrent human + computer-use agents

Describe the feature

Add opt-in logical input seats so one human and one or more trusted computer-use agents can share a single Wayfire session with independently visible cursors and keyboard focus.

Default behavior stays one seat. Extra seats would be named, optional, and assignable to physical or authorized virtual pointer/keyboard devices. Each seat would have its own cursor, pointer focus, keyboard focus, grabs, and pressed-key state. A seat could be bounded to an output. IPC or a plugin hook should list seats and disable a non-default seat (releasing keys/buttons).

Not requesting logind multi-seat, a second Wayfire process, or RDP/VNC.

Use case / Example

• Current behavior: An agent that injects pointer/keyboard events (Hermes, Claude Code, Codex, wlroots virtual pointer, etc.) shares Wayfire's one seat. Moving the agent pointer steals the human cursor. Typing from the agent steals keyboard focus.
• Proposed behavior: The human keeps seat0. An agent on seat-agent can operate a window on another output with its own cursor. The human can keep typing in their focused client.

Benefits

Computer-use on a multi-monitor desktop is currently all-or-nothing: either the human or the agent owns the one cursor. Independent seats let you supervise an agent without leaving your own work.

Sway already has named seats. Wayland wl_seat already allows more than one. zwlr_virtual_pointer_v1 can attach a pointer to a seat if the compositor keeps per-seat state.

Additional context

I searched issues for multi-seat / virtual pointer / multiple cursors and did not find this use case.

Non-goals: extra Linux users, extra GPUs, unrestricted input injection, promising correct Xwayland multi-seat before native Wayland is right.

The issue names no source files or tests. Start by locating Wayfire's existing seat handling and wlroots virtual-pointer integration, then assess how an IPC or plugin hook could list and disable seats. Done means optional named seats support independent cursors, focus, grabs, and pressed-key state while preserving the default single-seat behavior.