feat(menu): #79 slice 3 — Look & Feel › Auto theme (completes #79)

Adds an "Auto theme (on/off)" row to Look & Feel and an `autotheme`
submenu: toggle the feature, pick the day/night themes (from
`nomarchy-theme-sync list`), and set the sunrise/sunset times (HH:MM,
validated). This is the menu surface over settings.autoTheme, completing
the auto time-of-day theme feature (slices: CLI / timer / menu).

Enabling writes the flag and defaults the summer-day/summer-night pair
--no-switch, then runs `auto --force`, so a single rebuild both installs
the timer and applies the correct theme for now. Disabling is instant
(--no-switch): the flag flips and `auto` self-gates, so the lingering
timer no-ops until the next rebuild. Day/night/time writes are live
--no-switch (read by `auto` at tick time).

Verification: V1 — HM generation builds (bash -n on nomarchy-menu at
build) + bash -n on the built menu. Logic test with stubbed
rofi/theme-sync/notify: selecting the toggle from off runs exactly `set
day/night/enable ... --no-switch` then `auto --force` — the intended
one-rebuild path. V0 flake check green. All three #79 slices shipped;
the live timer switch across sunset is a real-session (V3) check on a
Nomarchy machine.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

agent/BACKLOG.md

@@ -28,28 +28,22 @@ in [`docs/ROADMAP.md`](../docs/ROADMAP.md); map in
 
 ## NEXT
 
-### 79. Auto time-of-day theme pair (`VISION § D`) `[big]` — split
-Auto light/dark theme switch through the **existing** engine (a timer runs
-`nomarchy-theme-sync apply`), one pipeline. State: `settings.autoTheme`
-`{enable, day, night, sunrise, sunset}` in theme-state.json. Slices:
-1. ~~**CLI primitive + schema**~~ ✓ shipped 2026-07-10 —
-   `nomarchy-theme-sync auto` resolves day/night from
-   `settings.autoTheme.{enable,day,night,sunrise,sunset}` and applies (only
-   if different — idempotent, so the timer won't needlessly rebuild);
-   `--which` prints the decision, `--force`/`--no-switch` too. `cmd_apply`
-   core factored into `apply_named` (behavior unchanged). V1 + functional
-   tests (day/night/disabled/missing-slugs, apply writes state, idempotent).
-2. ~~**Timer/hook**~~ ✓ shipped 2026-07-10 — `modules/home/autotheme.nix`:
-   `systemd.user.{service,timer}.nomarchy-auto-theme`, install gated on
-   `settings.autoTheme.enable` (read from state), `OnStartupSec=1min` +
-   `OnCalendar=*:0/15` + `Persistent`. Chose periodic (not exact
-   sunrise/sunset timers) — robust to suspend/DST, and `auto` is idempotent
-   so ticks are cheap. V1: real-config eval shows units land when enabled
-   (OnCalendar `*:0/15`, ExecStart `… auto`), absent when disabled;
-   systemd-analyze validates the schedule. **Real-session check pending**
-   (live timer→`home-manager switch`) — needs a Nomarchy machine, like #76.
-3. **Menu** — Look & Feel › Auto theme: enable/disable, pick day/night
-   themes, set times. Writes state.
+### 79. Auto time-of-day theme pair — all agent work shipped `[blocked:hw]`
+Auto light/dark theme switch through the existing engine, one pipeline
+(`VISION § D`). All 3 slices shipped 2026-07-10; design record in ROADMAP.
+Only the real-session check remains (needs a Nomarchy machine, like #76):
+- **CLI** — `nomarchy-theme-sync auto` (idempotent day/night apply;
+  `--which`/`--force`/`--no-switch`); `cmd_apply` core → `apply_named`.
+- **Timer** — `modules/home/autotheme.nix`: user service+timer, install
+  gated on `settings.autoTheme.enable`, `OnStartupSec=1min` +
+  `OnCalendar=*:0/15` + `Persistent`.
+- **Menu** — Look & Feel › Auto theme: toggle, pick day/night, set times
+  (enable rebuilds to install the timer + `auto --force`; disable is
+  instant `--no-switch`; day/night/times live `--no-switch`).
+
+**V3 remaining:** on a real Nomarchy session — enable from the menu, confirm
+the timer switches day↔night across the sunset/sunrise boundary (and the
+live `home-manager switch` from the timer succeeds).
 
 ### 76. Hibernation default — all agent work shipped `[blocked:hw]`
 Hibernation + zram on by default (product intent, Bernardo 2026-07-10).

agent/JOURNAL.md

@@ -17,6 +17,27 @@ Template:
 
 ---
 
+## 2026-07-10 — #79 slice 3: Look & Feel › Auto theme menu (#79 complete)
+- **Task:** BACKLOG #79 slice 3 — the menu; completes the feature.
+- **Did:** `rofi.nix` — "Auto theme (on/off)" row in Look & Feel + an
+  `autotheme)` submenu: toggle, pick day/night (from
+  `nomarchy-theme-sync list`), set sunrise/sunset (HH:MM input, validated).
+  Enable writes the flag + defaults the summer pair `--no-switch`, then
+  `exec auto --force` — one rebuild installs the timer AND applies the right
+  theme. Disable is instant `--no-switch` (`auto` self-gates; the lingering
+  timer no-ops). Day/night/times are live `--no-switch`.
+- **Verified:** **V1** — HM generation builds (`writeShellScriptBin` bash -n
+  on nomarchy-menu passes) + bash -n on the built menu. **Logic test**
+  (stubbed rofi/theme-sync/notify): selecting "Auto theme (off)" runs exactly
+  `set day summer-day`, `set night summer-night`, `set enable true`
+  (all `--no-switch`), then `auto --force` — the intended one-rebuild path.
+  Disable path is static-clear (set false `--no-switch`, no `auto`); a
+  stateful-stub dynamic test would loop (stub doesn't reflect the flip). V0
+  flake check green. **#79 collapsed to `[blocked:hw]`** (all 3 slices done;
+  only live-session switch remains, needs a Nomarchy machine).
+- **Pending:** V3 real-session (timer switches day↔night across sunset).
+- **Next suggestion:** NEXT head #76/#79 both `[blocked:hw]`; QA/PROPOSED.
+
 ## 2026-07-10 — #79 slice 2: auto-theme systemd timer
 - **Task:** BACKLOG #79 slice 2 — the timer/hook.
 - **Did:** `modules/home/autotheme.nix` (imported in home default.nix):