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.

pkgs/nomarchy-lifecycle/default.nix

@@ -15,12 +15,12 @@ let
     flake="''${NOMARCHY_PATH:-$HOME/.nomarchy}"
   '';
 
-  # Opt-in sweep (settings.autoCommit — the same flag theme-sync honours):
+  # Opt-in sweep (settings.autoCommit — the same flag state-sync honours):
   # commit EVERYTHING dirty in the machine flake before a pull/rebuild/
   # home switch, so hand edits to system.nix/home.nix and lock bumps land
   # in history at the moment they become live — `git log` mirrors the
-  # generation list. Complements nomarchy-theme-sync's auto_commit, which
-  # is pathspec-limited to theme-state.json on menu writes precisely so
+  # generation list. Complements nomarchy-state-sync's auto_commit, which
+  # is pathspec-limited to state.json on menu writes precisely so
   # half-finished hand edits never ride a settings-named commit; here the
   # sweep is the point, and the commit body lists what was swept. Never
   # fatal — callers `|| true` so a git hiccup can't block a rebuild. Not
@@ -31,8 +31,12 @@ let
     label="''${1:-rebuild}"
     [ -d "$flake/.git" ] || exit 0
     command -v git >/dev/null 2>&1 || exit 0
+    # #107: prefer state.json; still honour a legacy theme-state.json
+    # until the next menu write migrates the checkout.
+    state="$flake/state.json"
+    [ -r "$state" ] || state="$flake/theme-state.json"
     flag=$(${jq}/bin/jq -r '.settings.autoCommit // false' \
-             "$flake/theme-state.json" 2>/dev/null || true)
+             "$state" 2>/dev/null || true)
     [ "$flag" = "true" ] || exit 0
     dirty=$(git -C "$flake" status --porcelain || true)
     [ -n "$dirty" ] || exit 0