feat(display): per-profile workspace→output pins (item 15c)

A display profile can now pin workspaces to outputs:

  docked = {
    monitors   = [ … ];
    workspaces = { "1" = "DP-3"; "9" = "eDP-1"; };
  };

The bare list-of-monitors shape still works (either-type; hyprland.nix
normalizes — coercedTo refuses list-of-submodule sources). Pins bake as
Hyprland `workspace` rules from the active profile and apply instantly
on `nomarchy-display-profile apply`: keyword sets the session rule,
moveworkspacetomonitor moves open workspaces over. Pins from a
previously applied profile linger in-session until reload/rebuild
(hyprctl can only add) — inert if the output is absent, noted in the
applier.

V1: flake check green (checks.display-profiles now asserts
workspaceRule) + scratch-downstream eval: baked settings carry both
rule sets, the generated applier has the keyword+dispatch pairs
(bash -n), match/list correct with mixed shapes. V3 queued in
HARDWARE-QUEUE (rides the dock test). Item 15 complete — deleted.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

templates/downstream/home.nix

@@ -40,12 +40,15 @@
   # ];                                  #   (class from `hyprctl clients`)
   #
   # nomarchy.displayProfiles = {        # named layouts for the SAME outputs —
-  #   docked = [                        #   switch: System › Display › Profiles
-  #     { name = "eDP-1"; resolution = "disable"; }
-  #     { name = "DP-3"; position = "0x0"; }
-  #     { name = "DP-4"; position = "auto-right"; }
-  #   ];
-  #   undocked = [ { name = "eDP-1"; position = "0x0"; } ];
+  #   docked = {                        #   switch: System › Display › Profiles
+  #     monitors = [
+  #       { name = "eDP-1"; resolution = "disable"; }
+  #       { name = "DP-3"; position = "0x0"; }
+  #       { name = "DP-4"; position = "auto-right"; }
+  #     ];
+  #     workspaces = { "1" = "DP-3"; "9" = "DP-4"; }; # optional ws→output pins
+  #   };
+  #   undocked = [ { name = "eDP-1"; position = "0x0"; } ]; # bare list = monitors only
   # };                                  #   applied instantly + remembered in the
   #                                     #   flake state (settings.displayProfile);
   #                                     #   the menu's Auto-switch row makes dock/