feat(power): suspend-then-hibernate 1h on battery (#115)

Human decision: 1h delay, battery only, Preferences enable/disable.
Wire systemd suspend-then-hibernate + HibernateDelaySec=1h +
HibernateOnACPower=false when settings.power.suspendThenHibernate is on
and boot.resumeDevice is set. Lid: s2h undocked, plain suspend on AC.
nomarchy-suspend for hypridle + Power menu (live state). LUKS unlock
before encrypted hibernate so s2h→disk is not double-password.
state-bridges assert the policy; HARDWARE-QUEUE #115 + suggested order.

V1: nix flake check --no-build. V3: bag-carry on hardware.

agent/JOURNAL.md

@@ -19,6 +19,16 @@ Template:
 
 ---
 
+## 2026-07-15 — #115 suspend-then-hibernate (1h, battery-only + menu)
+- **Task:** Human settled delay=1h, battery only, menu enable/disable.
+- **Did:** `nomarchy-suspend` + logind/sleep bridge from
+  `settings.power.suspendThenHibernate` (default on; needs resumeDevice).
+  Preferences toggle (rebuild). Unlock-before-encrypted-hibernate for s2h→disk.
+  HARDWARE-QUEUE: #115 steps + suggested-order sweep (top 8).
+- **Verified:** V0/V1 `nix flake check --no-build` incl. state-bridges s2h cases.
+- **Pending:** V3 bag-carry / 1h on battery (HARDWARE-QUEUE #115).
+- **Next suggestion:** human runs HARDWARE-QUEUE suggested order, or #120.
+
 ## 2026-07-15 — #98 GTK dialog button black-on-dark (Boreal)
 - **Task:** Bernardo: GTK dialog button labels black vs dark Boreal chrome.
 - **Did:** Root cause — Stylix pins light `adw-gtk3` for all polarities.