docs(agent): FUTURE formatter; hibernation intent + zram note

Formatter yes-but-later. Hibernation wanted by default (disk swap);
zram compatible alongside for live pressure, not as sole swap.

agent/BACKLOG.md

@@ -134,11 +134,19 @@ decide. **Resolved** entries stay for history; agents treat them as closed.
   default). TLP remains the one-line opt-in. Rationale: stability + live
   profile API for menu/Waybar; Omarchy’s TLP experiment reverted.
 
-### Still open
+### Resolved (2026-07-10, more)
 
-- **Formatter adoption:** repo deliberately has none; `nixfmt-rfc-style`
+- **Formatter adoption** — **yes, but not now.** Tracked as FUTURE
-  would flatten the aligned hand-formatting of ~33 files. Adopt or
+  (below). Nix-source style only (`nixfmt-rfc-style` or similar); one
-  declare never? (See reply in session: Nix-source style only, not runtime.)
+  bulk reformat + CI/check when promoted. Until then: hand-aligned
-- **zram swap:** faster under pressure, but interacts with the
+  style per CONVENTIONS.
-  hibernation-swapfile story (resume device/priority). Adopt,
+
-  adopt-with-hibernation-guard, or skip?
+- **Hibernation** — **want by default** (product intent). Needs a
+  disk-backed swap (file or partition) sized for resume; not zram alone.
+  Implementation is a future/NEXT item when designed (installer +
+  resume device + encrypted-root story).
+
+### Still open (design, not binary yes/no)
+
+- **zram alongside hibernation:** compatible — see FUTURE note. Decide
+  default **on** (zram + disk swap) vs disk-only when hibernation ships.