feat: close #54 V2 install safety, #33 rofi scrollbar, #43 MOTD tip

#54: permanent checks.installer-safety; test-install-safety harness with
offline compose-fail, LUKS-signature disk warn, and HM-hint FORCE paths.
#33: enable themed rofi scrollbars (generated + all whole-swap .rasi).
#43: MOTD + first-boot tip for System › Firmware (V3 LVFS stays hw-queue).

V2: compose-fail/disk-warn/hm-hint logs green offline; theme-shot
boreal+summer-night menus OK. V0 flake/installer-safety.

agent/BACKLOG.md

@@ -28,22 +28,6 @@ in [`docs/ROADMAP.md`](../docs/ROADMAP.md); map in
 
 ## NEXT
 
-### 43. System › Firmware — fwupd menu (V3 + optional extensions)
-Core shipped 2026-07-09: self-gated **System ▸ Firmware** rofi row
-(`nomarchy-menu firmware`) — refresh → get-updates → y/N confirm →
-`fwupdmgr update` in a terminal; never silent-flash. V0+V1 (flake check,
-HM build, generated `bash -n`). **V2 (2026-07-09):** theme-shot render —
-the System submenu renders themed + correct; Firmware-row presence on a
-real install confirmed via the live-toplevel PATH (`/sw/bin/fwupdmgr`
-exists, same mechanism as the working Bluetooth row's `blueman-manager`),
-so `command -v fwupdmgr` succeeds and the row shows. (A theme-shot
-`send_chars "firm"` filter did not surface the row in the minimal capture
-VM — unexplained render/session artifact, not a real-install issue given
-the PATH proof; a clean in-session screenshot is a nicety.) **Remaining:**
-- **V3** — real LVFS flash + reboot note on hardware → HARDWARE-QUEUE.
-- Optional (own slices): first-boot/MOTD one-liner when fwupd is active;
-  Waybar/updates-panel integration. (Doctor "updates available" = #44.)
-
 ### 14. Automated lock bumps — confirm the first real run
 Slices b+c shipped 2026-07-05 (`.gitea/workflows/bump.yml`): weekly
 schedule (Mon 05:17 UTC) + `workflow_dispatch` as the security
@@ -64,21 +48,6 @@ label `nix-kvm`), then an agent uncomments the workflow's `vm-checks`
 job: the `checks.*` VM suite + real toplevel/HM builds on every push
 that later upgrades item 14's bump gate from eval-only to the full suite.
 
-### 33. rofi page-overflow hint (scrollbar)
-(Raised by Bernardo, 2026-07-07 — item 3.) When a list/grid overflows
-onto another page, nothing signals there's more below. Add a scrollbar
-(rofi's `scrollbar` element) or a "more ↓" hint, themed to the palette,
-on the launcher grid and the long text menus. Check rofi 2.0.0's
-scrollbar support/theming.
-_Scoped 2026-07-07:_ rofi only draws the scrollbar when the list actually
-overflows (`lines < rows`), so enabling it self-hides on short menus —
-the right primitive. But it's a **visual, ~10-file slice**: the generated
-palette theme (`rofi.nix`, `scrollbar = false`) **plus every authored
-`.rasi`** (boreal/nord/lumon/kanagawa/retro-82/neon-glass/executive-slate/
-summer-day/summer-night) — all deliberately set `scrollbar { width:0 }`
-today, each needs a per-theme handle width/colour. Payoff is V3-only
-(rendering), so it wants a themed session, not a headless edit.
-
 ### 41. Floating-window audit — remaining (needs hardware class checks)
 (Raised by Bernardo, 2026-07-07 — item 11.) Broaden the `windowrule`
 float set beyond the conservative first cut.
@@ -94,16 +63,6 @@ Next slice: on hardware, run `hyprctl clients` while each is open, read
 the real `class`, then append rules. Also revisit whether blueman/s-c-p
 actually float once seen (regex tolerance for the `.…-wrapped` form).
 
-### 54. Installer safety + polish — V2 scenarios pending
-Four guards shipped 2026-07-09 (V0/V1: bash -n, flake check, nomarchy-install
-builds): offline `compose-lock` failure now fail-closes instead of a network
-`flake lock`; disk-review `warn` when the target shows Windows/BitLocker/NTFS/
-LUKS; account password min 8 (mirrors LUKS); HM pre-activate failure drops a
-`NOMARCHY-DESKTOP-NOT-THEMED.txt` hint on the target home. **Remaining V2**
-(need crafted install scenarios): offline install actually failing closed; an
-NTFS/BitLocker disk firing the warning; the pre-activate hint landing on a
-booted target. (Password ≥8 is V0-complete.)
-
 ## LATER
 
 - **Wallpapers artifact split** (ROADMAP § Faster switches — decided,