feat(menu): group keybinds cheatsheet Window/Workspace/Menu/Media (#108)

Every bind in keybinds.nix carries a group; SUPER+? renders section
headers. checks.keybinds-cheatsheet asserts all groups are valid and
every description appears in the sheet (same source as Hyprland binds).

Verified: V0 flake check; built cheatsheet shows ── Window ── / etc.

agent/BACKLOG.md

@@ -261,13 +261,6 @@ scoped implementation/verification tasks before work starts. Pass = every
 current route has one deliberate home, navigation remains shallow, and no
 root-level entry is added or lost.
 
-### 108. Keybindings menu presentation and completeness audit
-
-Group the menu as Window, Workspace, Menu, and Media, then prove every live
-Hyprland binding appears from the canonical source. Do not repeat the obsolete
-claim that float/move bindings are absent. Pass = presentation is scannable and
-an automated comparison detects omissions or stale displayed bindings.
-
 ### 110. `[big]` Retire Control Center safely
 
 Split this into two phases before implementation: first build a migration/drop

agent/JOURNAL.md

@@ -19,6 +19,16 @@ Template:
 
 ---
 
+## 2026-07-15 — #108 keybinds cheatsheet groups + completeness check
+- **Task:** BACKLOG #108 — group SUPER+? as Window/Workspace/Menu/Media;
+  automated completeness.
+- **Did:** every bind/extra in keybinds.nix gets `group`; cheatsheet renders
+  section headers; `checks.keybinds-cheatsheet` asserts groups + every desc
+  present (proved via assert).
+- **Verified:** V0 flake check; cheatsheet file shows ── Window ── etc.
+- **Pending:** V3 eyeball SUPER+? on a real session (optional).
+- **Next suggestion:** #94 residual or #107 state.json rename.
+
 ## 2026-07-15 — Fix batch #112 disk picker, #106 menu Back, #113 offline theme
 - **Task:** Second fix-only batch from NEXT/NOW residuals.
 - **Did:** (112) `list_installable_disks` excludes fd/loop/sr/zram/tiny