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>

agent/JOURNAL.md

@@ -17,6 +17,27 @@ Template:
 
 ---
 
+## 2026-07-05 — display-profile workspace pins (iteration #47, item 15c)
+- **Task:** item 15 slice (c), the last one — per-profile workspace →
+  output pinning. Item 15 deleted (a/b/c all shipped; V3s queued).
+- **Did:** a profile is now `{ monitors; workspaces = { "1" = "DP-3"; }; }`
+  (bare list still accepted — either-type + normalization in
+  hyprland.nix; coercedTo refuses list-of-submodule sources). Pins bake
+  as Hyprland `workspace` rules and apply instantly on profile switch
+  (`hyprctl keyword workspace` + `dispatch moveworkspacetomonitor`).
+  monitor-rules.nix gained pure `workspaceRule`; template + README
+  updated.
+- **Verified:** V1 flake check green (incl. the extended
+  checks.display-profiles assert) + scratch-downstream eval: baked
+  settings render both rule sets, the generated applier carries the
+  keyword+dispatch pairs (bash -n OK), match/list still correct with
+  mixed profile shapes.
+- **Pending:** V3 queued (workspace-pins entry in HARDWARE-QUEUE, rides
+  the slice-a dock test). Stale-pin note documented in the applier.
+- **Next suggestion:** backlog is now human/event-gated (28 taste
+  calls, 14 Monday, 18 Decision, 20 KVM) — idle the loop or triage
+  PROPOSED.
+
 ## 2026-07-05 — icon-weight A/B for the human call (iteration #46, item 28)
 - **Task:** item 28's last `[human]` blocker — make the color-vs-
   symbolic menu-icon decision cheap.