docs(backlog): design pass for display profiles (item 15)

The item required a written plan before coding. Option shape reuses the
existing monitorType submodule (attrsOf (listOf monitorType)); active
profile is in-flake state (settings.displayProfile) on the night-light
instant+bake pattern; whole-entry-by-name rebuild overlay with a
disable-guard so a stale menu resolution pick can't resurrect a
disabled panel; self-gated System > Display profile row; sliced a/b/c
with hotplug auto-switch and workspace binding deferred behind the
core picker. kanshi remains a non-goal.

Verified: V0 (docs-only change).

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

agent/JOURNAL.md

@@ -17,6 +17,21 @@ Template:
 
 ---
 
+## 2026-07-05 — display-profiles design pass (iteration #27, item 15, no code)
+- **Task:** BACKLOG NEXT#15 — the entry itself demands "design first,
+  write the plan into this entry before coding". Backlog-only iteration.
+- **Did:** wrote the plan into item 15: `nomarchy.displayProfiles =
+  attrsOf (listOf monitorType)` (reuse the existing submodule),
+  `settings.displayProfile` state via the night-light pattern (instant
+  hyprctl apply + bake on rebuild), whole-entry-by-name overlay with a
+  disable-guard against stale resolution picks, self-gated menu row,
+  three slices (option+overlay+menu / opt-in hotplug auto-switch /
+  per-profile workspace binding), kanshi stays a non-goal.
+- **Verified:** V0 (docs-only; flake untouched).
+- **Pending:** nothing — 15a is now directly codeable.
+- **Next suggestion:** 15a (option + overlay + menu picker), or #16
+  greeter theming if a fresh session prefers a self-contained item.
+
 ## 2026-07-05 — scheduled lock-bump workflow (iteration #26, item 14 b+c)
 - **Task:** BACKLOG NEXT#14 `[big]` — split: (a) checks-on-push shipped
   earlier; this ships (b) the weekly bump + (c) the fast-lane as