feat(autotheme): fire at the configured sunrise/sunset, not a 15-min poll

The timer's OnCalendar now bakes the configured times (falling back
like _hhmm_to_min on a hand-edited state), so the switch lands at the
configured minute instead of up to 15 minutes late. The original
poll's robustness case is covered without it: Persistent catches
transitions missed while powered off, systemd fires elapsed calendar
timers on resume, and OnStartupSec settles the theme after login.

Baked times mean a time edit must rebuild: the menu's Sunrise/Sunset
writes now run `auto --force` when enabled (one rebuild re-bakes the
timer and lands on the right theme, same as the enable flow). Day and
night slugs stay live reads — but with no poll to catch them up,
editing the slot currently on screen applies immediately via a plain
`auto`. New eval check `auto-theme-timer` asserts the bake
state-bridges-style: configured times reach OnCalendar, garbage falls
back to 07:00/20:00, disabled installs no unit. Docs + hardware-queue
entry updated to the new semantics.

V2: checks.auto-theme (KVM VM, passed) covers the auto engine the
timer ticks; checks.auto-theme-timer (eval, passed) covers the unit;
OnCalendar strings systemd-analyze-validated; the rebuilt menu script
passes bash -n with the new branches in place. V3 pending: live timer
firing at the exact configured minute on hardware (existing
"Auto-theme pair flip" queue entry, refreshed).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

agent/HARDWARE-QUEUE.md

@@ -52,11 +52,18 @@ Everything else below stays open; order is convenience, not a gate.
       summer-day; this is the on-hardware confirmation of the report.
 - [ ] **Auto-theme pair flip on hardware** — set
       `settings.autoTheme.{day,night}` to one of the new pairs (e.g.
-      kiln-clay / kiln), force sunrise/sunset around the current time,
-      let the timer flip once each way. Pass = the whole desktop switches
-      in one generation, and nothing leaks from the previous theme —
-      fonts, rounding, terminal opacity all reset (the per-theme
-      appearance block), wallpaper follows.
+      kiln-clay / kiln), set sunset (or sunrise) a few minutes ahead via
+      Look & Feel › Auto theme (the time edit itself rebuilds — since the
+      exact-time revision the timer fires AT the configured minute, no
+      15-min poll), let the timer flip once each way. Pass = (1)
+      `systemctl --user list-timers nomarchy-auto-theme` shows the two
+      configured times as the trigger; (2) the switch lands within ~a
+      minute of the configured time; (3) the whole desktop switches in
+      one generation, and nothing leaks from the previous theme — fonts,
+      rounding, terminal opacity all reset (the per-theme appearance
+      block), wallpaper follows; (4) with autoCommit on, `git -C
+      ~/.nomarchy log` shows an `apply theme` commit and state.json is
+      not left dirty (the 0.5.1 pathspec fix).
 - [ ] **#148 dock-intent enforcement without auto-profiles (dev box, docked)** —
       after pulling the #148 commit: **log out and back in first** — the
       watcher is `exec-once`, so `nomarchy-home` alone leaves the old one

docs/OVERRIDES.md

@@ -70,11 +70,12 @@ State lives in `settings.autoTheme`:
 | `day` / `night` | theme slugs (see `nomarchy-state-sync list`) — the exclusive pairs are made for this: `boreal-dawn`/`boreal`, `executive-ivory`/`executive-slate`, `kiln-clay`/`kiln`, `summer-day`/`summer-night` |
 | `sunrise` / `sunset` | switch times, `"HH:MM"` (24-hour) |
 
-A timer re-checks every ~15 minutes: the day theme applies around sunrise, the
-night theme around sunset — but it only rebuilds when the active theme
-actually needs to change, so most checks do nothing. Enabling rebuilds once
-(to install the timer); disabling is instant. Preview the current decision
-without switching with `nomarchy-state-sync auto --which`.
+A timer fires exactly at the configured sunrise and sunset (plus once shortly
+after login, and it catches up on a transition missed while the machine was
+off or asleep) — it only rebuilds when the active theme actually needs to
+change. The times are baked into the timer, so editing them (or enabling)
+rebuilds once; disabling is instant. Preview the current decision without
+switching with `nomarchy-state-sync auto --which`.
 
 These values are deliberately kept at normal priority in the modules, so they
 stay owned by the theme system. If you *insist* on pinning one in `home.nix`

docs/ROADMAP.md

@@ -316,11 +316,17 @@ Design/decision records and a running log of shipped work (items marked
   drives `nomarchy-state-sync auto`, which picks day vs night by the local
   clock and applies the preset **only if it differs** (idempotent).
   `modules/home/autotheme.nix` installs a user timer
-  (`OnStartupSec` + `OnCalendar=*:0/15` + `Persistent`, gated on the state
+  (`OnStartupSec` + `OnCalendar` + `Persistent`, gated on the state
   flag) that ticks `auto`; Look & Feel › Auto theme toggles it and picks the
   pair/times. `cmd_apply`'s core was factored into `apply_named` so `auto`
-  reuses it verbatim. Periodic (not exact sunrise/sunset timers) for
-  robustness to suspend/DST; the idempotent `auto` keeps ticks cheap. Enable
+  reuses it verbatim. Originally a 15-min poll (`OnCalendar=*:0/15`) for
+  robustness to suspend/DST; **revised** (Bernardo 2026-07-18) to fire
+  exactly at the configured sunrise/sunset — `Persistent` covers powered-off
+  gaps, systemd fires elapsed calendar timers on resume, and `OnStartupSec`
+  settles login, so the poll bought nothing but a ≤15-min switch lag. The
+  times are now baked into `OnCalendar`, so the menu's Sunrise/Sunset edits
+  rebuild via `auto --force` (day/night slugs stay live reads; editing the
+  on-screen slot applies immediately since no poll catches it up). Enable
   rebuilds once (installs the timer + `auto --force`); disable is instant
   (the flag flips and `auto` self-gates). **V2:** `checks.auto-theme` moves
   the VM clock across a configured sunset/sunrise and asserts the theme flips

flake.nix

@@ -342,6 +342,48 @@
               pkgs.runCommand "nomarchy-state-bridges" { }
                 "touch $out"; # all ${toString (builtins.length cases)} assertions held at eval
 
+          # The baked auto-theme timer (#79 revision): sunrise/sunset land in
+          # the unit's OnCalendar at rebuild, and nothing in a build fails
+          # when that bake goes stale or produces a calendar systemd rejects
+          # — so assert it at eval, state-bridges style.
+          auto-theme-timer =
+            let
+              homeWith = stateFile:
+                (downstream.homeConfigurations.me.extendModules {
+                  modules = [{
+                    nomarchy.stateFile = nixpkgs.lib.mkForce stateFile;
+                  }];
+                }).config;
+              atState = name: at: stateFileOf name { settings.autoTheme = at; };
+              on = homeWith (atState "state-autotheme-on.json" {
+                enable = true; day = "summer-day"; night = "summer-night";
+                sunrise = "06:30"; sunset = "21:45";
+              });
+              garbage = homeWith (atState "state-autotheme-garbage.json" {
+                enable = true; day = "summer-day"; night = "summer-night";
+                sunrise = "sometime"; sunset = "25:99";
+              });
+              off = homeWith absentState; # template carries no autoTheme key
+              cal = c: c.systemd.user.timers.nomarchy-auto-theme.Timer.OnCalendar;
+              cases = [
+                { n = "configured times are baked into OnCalendar";
+                  ok = cal on == [ "*-*-* 06:30:00" "*-*-* 21:45:00" ]; }
+                { n = "garbage times fall back to 07:00/20:00";
+                  ok = cal garbage == [ "*-*-* 07:00:00" "*-*-* 20:00:00" ]; }
+                { n = "disabled → no timer unit installed";
+                  ok = !(off.systemd.user.timers ? nomarchy-auto-theme); }
+              ];
+              failed = builtins.filter (c: !c.ok) cases;
+            in
+            if failed != [ ] then
+              throw ''
+                Auto-theme timer bake broken — settings.autoTheme no longer
+                reaches the unit as expected:
+                ${nixpkgs.lib.concatMapStringsSep "\n" (c: "  ✗ ${c.n}") failed}''
+            else
+              pkgs.runCommand "nomarchy-auto-theme-timer" { }
+                "touch $out"; # all ${toString (builtins.length cases)} assertions held at eval
+
           # The bridge, end to end on a booted machine: checks.state-bridges
           # proves the option flips at eval, this proves a state key alone
           # reaches a RUNNING service. The node sets no

modules/home/autotheme.nix

@@ -1,18 +1,37 @@
 # Auto time-of-day theme switch (BACKLOG #79, VISION § D). A user timer
-# periodically runs `nomarchy-state-sync auto`, which reads
-# settings.autoTheme = { enable, day, night, sunrise, sunset } from the
-# state file and applies the day or night preset for the current clock —
-# through the SAME one engine as a manual `apply` (no second pipeline).
+# runs `nomarchy-state-sync auto` at the configured sunrise and sunset,
+# which reads settings.autoTheme = { enable, day, night, sunrise, sunset }
+# from the state file and applies the day or night preset for the current
+# clock — through the SAME one engine as a manual `apply` (no second
+# pipeline).
 #
-# The command self-gates (no-op when disabled) and is idempotent (it only
-# rebuilds when the active theme actually needs to change), so the timer
-# can tick freely. Install is gated on the state flag (like nomarchy.updates
-# gates on its enable), so a machine not using the feature carries no timer;
-# enabling it from the menu (slice 3) writes the flag + rebuilds, which is
-# what brings the timer into being.
+# The trigger times are BAKED into OnCalendar at rebuild (originally this
+# was a 15-min poll; exact times won on wasted wakeups — Bernardo
+# 2026-07-18), so a time edit must rebuild: the menu's Sunrise/Sunset
+# writes run `auto --force`, whose apply is that rebuild. Missed
+# transitions are covered without polling: Persistent=true catches ones
+# that pass while powered off, systemd fires elapsed OnCalendar timers on
+# resume from suspend, and OnStartupSec settles the theme just after
+# login. The command self-gates (no-op when disabled) and is idempotent
+# (it only rebuilds when the active theme actually needs to change), so
+# every extra firing is cheap.
+#
+# Install is gated on the state flag (like nomarchy.updates gates on its
+# enable), so a machine not using the feature carries no timer; enabling
+# it from the menu (slice 3) writes the flag + rebuilds, which is what
+# brings the timer into being.
 { config, lib, pkgs, ... }:
 
-lib.mkIf (config.nomarchy.settings.autoTheme.enable or false) {
+let
+  at = config.nomarchy.settings.autoTheme or { };
+  # "HH:MM" or the fallback — mirrors _hhmm_to_min in nomarchy-state-sync,
+  # so a hand-edited state can't bake an OnCalendar systemd rejects.
+  hhmm = v: fallback:
+    if builtins.isString v
+       && builtins.match "([01][0-9]|2[0-3]):[0-5][0-9]" v != null
+    then v else fallback;
+in
+lib.mkIf (at.enable or false) {
   systemd.user.services.nomarchy-auto-theme = {
     Unit.Description = "Apply the day/night theme for the current time";
     Service = {
@@ -25,10 +44,13 @@ lib.mkIf (config.nomarchy.settings.autoTheme.enable or false) {
   };
 
   systemd.user.timers.nomarchy-auto-theme = {
-    Unit.Description = "Periodic day/night theme check";
+    Unit.Description = "Day/night theme switch at sunrise and sunset";
     Timer = {
       OnStartupSec = "1min";   # settle on the right theme shortly after login
-      OnCalendar = "*:0/15";   # re-check every 15 min; auto no-ops if unchanged
+      OnCalendar = [
+        "*-*-* ${hhmm (at.sunrise or null) "07:00"}:00"  # sunrise → day
+        "*-*-* ${hhmm (at.sunset  or null) "20:00"}:00"  # sunset  → night
+      ];
       Persistent = true;       # catch a transition missed while powered off
     };
     Install.WantedBy = [ "timers.target" ];

modules/home/rofi.nix

@@ -962,13 +962,16 @@ ${lib.concatStringsSep "\n" (lib.mapAttrsToList
       autotheme)
         # Look & Feel › Auto theme — automatic day/night theme switch
         # (settings.autoTheme, applied by the nomarchy-auto-theme timer from
-        # autotheme.nix). The enable flag GATES the timer's install, so
-        # turning it *on* must rebuild; day/night/times are read live by
-        # `nomarchy-state-sync auto`, so those writes are instant
-        # (--no-switch). Enabling writes the flag then `auto --force`, so a
-        # single rebuild both installs the timer and applies the right theme
-        # now. Disabling is instant: the flag flips and `auto` self-gates to
-        # a no-op, so the lingering timer does nothing until the next rebuild.
+        # autotheme.nix). The enable flag GATES the timer's install and the
+        # sunrise/sunset times are BAKED into its OnCalendar, so turning it
+        # *on* or editing a time must rebuild — both run `auto --force`, so
+        # one rebuild re-bakes the timer AND lands on the right theme now.
+        # Day/night slugs are read live by `nomarchy-state-sync auto`, so
+        # those writes are instant (--no-switch); when the edited slot is the
+        # one on screen, a plain `auto` applies it right away (the timer only
+        # fires at the next transition — there is no poll to catch it up).
+        # Disabling is instant: the flag flips and `auto` self-gates to a
+        # no-op, so the lingering timer does nothing until the next rebuild.
         at_get() { nomarchy-state-sync get "settings.autoTheme.$1" 2>/dev/null; }
         en=$(at_get enable); day=$(at_get day); night=$(at_get night)
         sunrise=$(at_get sunrise); sunset=$(at_get sunset)
@@ -997,15 +1000,20 @@ ${lib.concatStringsSep "\n" (lib.mapAttrsToList
             nomarchy-state-sync --quiet set settings.autoTheme.enable true --no-switch
             notify-send "Auto theme" "On — applying the theme for now…"
             exec nomarchy-state-sync auto --force ;;   # one rebuild: install timer + apply
-          "Day theme"*)
-            slug=$( { nomarchy-state-sync list; printf '%s\n' "$BACK"; } | rofi_menu -p "Day theme") || exec "$0" autotheme
-            [ "$slug" != "$BACK" ] && [ -n "$slug" ] \
-              && nomarchy-state-sync --quiet set settings.autoTheme.day "$slug" --no-switch
-            exec "$0" autotheme ;;
-          "Night theme"*)
-            slug=$( { nomarchy-state-sync list; printf '%s\n' "$BACK"; } | rofi_menu -p "Night theme") || exec "$0" autotheme
-            [ "$slug" != "$BACK" ] && [ -n "$slug" ] \
-              && nomarchy-state-sync --quiet set settings.autoTheme.night "$slug" --no-switch
+          "Day theme"*|"Night theme"*)
+            key=day; label="Day theme"
+            case "$choice" in "Night theme"*) key=night; label="Night theme" ;; esac
+            slug=$( { nomarchy-state-sync list; printf '%s\n' "$BACK"; } | rofi_menu -p "$label") || exec "$0" autotheme
+            if [ "$slug" != "$BACK" ] && [ -n "$slug" ]; then
+              nomarchy-state-sync --quiet set "settings.autoTheme.$key" "$slug" --no-switch
+              # Edited the slot that is on screen right now? Apply it — the
+              # timer won't fire again until the next sunrise/sunset.
+              if [ "$en" = true ] && [ "$(nomarchy-state-sync auto --which)" = "$slug" ] \
+                 && [ "$(nomarchy-state-sync get slug)" != "$slug" ]; then
+                notify-send "Auto theme" "$label: $slug — applying…"
+                exec nomarchy-state-sync auto
+              fi
+            fi
             exec "$0" autotheme ;;
           "Sunrise"*|"Sunset"*)
             key=sunrise; label=Sunrise; cur="''${sunrise:-07:00}"
@@ -1014,7 +1022,14 @@ ${lib.concatStringsSep "\n" (lib.mapAttrsToList
             case "$t" in
               ""|"$BACK") : ;;
               [01][0-9]:[0-5][0-9]|2[0-3]:[0-5][0-9])
-                nomarchy-state-sync --quiet set "settings.autoTheme.$key" "$t" --no-switch ;;
+                nomarchy-state-sync --quiet set "settings.autoTheme.$key" "$t" --no-switch
+                # The time is baked into the timer's OnCalendar, so a change
+                # must rebuild; `auto --force` is that rebuild AND lands on
+                # the right theme for the new schedule in the same pass.
+                if [ "$en" = true ]; then
+                  notify-send "Auto theme" "$label $t — rebuilding the schedule…"
+                  exec nomarchy-state-sync auto --force
+                fi ;;
               *) notify-send "Auto theme" "Ignored '$t' — use HH:MM (24-hour)." ;;
             esac
             exec "$0" autotheme ;;