refactor(#107): theme-state.json → state.json, theme-sync → state-sync

The machine flake's git-tracked settings file is system state, not
"theme" only — rename it to state.json. CLI becomes nomarchy-state-sync
with a nomarchy-theme-sync symlink for scripts and muscle memory.

Eval (mkFlake, doctor, lifecycle) still accepts theme-state.json; the
next write migrates to state.json and removes the legacy file.
Documented in MIGRATION.md; drop the CLI alias after release notes.

modules/nixos/default.nix

@@ -24,11 +24,11 @@ let
   # Control Center's Bluetooth toggle writes settings.bluetooth.enable; read
   # it from the state file, the only place it exists on the NixOS side (the
   # hardware.nix/timezone.nix bridge). Missing/invalid JSON fails closed via
-  # theme-state-read.nix rather than a raw stack. null = key absent, which
+  # state-read.nix rather than a raw stack. null = key absent, which
   # leaves the option's own default (true) alone.
   sysState =
     if cfg.stateFile != null
-    then import ../theme-state-read.nix { inherit lib; } cfg.stateFile
+    then import ../state-read.nix { inherit lib; } cfg.stateFile
     else { };
   stateBluetooth =
     let v = (sysState.settings or { }).bluetooth.enable or null;
@@ -70,7 +70,7 @@ in
         nomarchy-pull                       update flake inputs (nomarchy, nixpkgs, …)
         nomarchy-rebuild                    rebuild the system (current lock)
         nomarchy-home                       rebuild the desktop / Home Manager
-        nomarchy-theme-sync apply <theme>   switch the whole palette
+        nomarchy-state-sync apply <theme>   switch the whole palette
         nomarchy-doctor                     read-only health check
         SUPER+?                             keybindings cheatsheet
         SUPER+M → System › Firmware         check LVFS firmware updates (fwupd)
@@ -336,7 +336,7 @@ in
     # ── Fonts ────────────────────────────────────────────────────────
     # The ten most popular Nerd Fonts ship by default, so any of them
     # can be named in the theme state's fonts.mono and actually resolve
-    # (nomarchy-theme-sync warns when a configured font is missing).
+    # (nomarchy-state-sync warns when a configured font is missing).
     fonts = {
       packages = with pkgs; [
         nerd-fonts.jetbrains-mono
@@ -373,7 +373,7 @@ in
 
     # ── Essential packages ───────────────────────────────────────────
     environment.systemPackages = with pkgs; [
-      nomarchy-theme-sync # provided by overlays.default
+      nomarchy-state-sync # provided by overlays.default
       nomarchy-doctor     # read-only health check (System › Doctor)
       nomarchy-control-center # TUI control center
       nomarchy-detect-hw  # post-install hardware re-probe (HARDWARE.md §8)
@@ -508,7 +508,7 @@ in
         experimental-features = [ "nix-command" "flakes" ];
         auto-optimise-store = lib.mkDefault true;
         # The downstream flake (~/.nomarchy) is meant to be a live working
-        # tree: nomarchy-theme-sync rewrites theme-state.json on every
+        # tree: nomarchy-state-sync rewrites state.json on every
         # switch (and you needn't commit each tweak), so the "Git tree is
         # dirty" warning fires on every rebuild and is pure noise here.
         warn-dirty = lib.mkDefault false;