Add the plebleader daily sync and package the archive CLI

`sync` refreshes the token chain first, then fetches new BeatLeader and
ScoreSaber scores (with a day of overlap), their replays, score stats,
leaderboards and map zips, and re-snapshots every played hash on Sundays.
The flake's plebleader-archive package runs the CLI with Node's type
stripping.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

flake.nix

@@ -44,12 +44,35 @@
           mainProgram = "plebsaber-stream";
         };
       };
+    # The plebleader archive CLI (scripts/archive, docs/plan.md): plain
+    # TypeScript with only Node built-ins, run through Node's type stripping.
+    mkArchiveCli = pkgs:
+      pkgs.stdenvNoCC.mkDerivation {
+        pname = "plebleader-archive";
+        version = "0.1.0";
+        src = ./scripts/archive;
+        nativeBuildInputs = [ pkgs.makeWrapper ];
+        installPhase = ''
+          runHook preInstall
+          mkdir -p $out/lib/plebleader-archive
+          cp *.ts $out/lib/plebleader-archive/
+          makeWrapper ${pkgs.nodejs_22}/bin/node $out/bin/plebleader-archive \
+            --add-flags "--experimental-strip-types --disable-warning=ExperimentalWarning" \
+            --add-flags "$out/lib/plebleader-archive/cli.ts"
+          runHook postInstall
+        '';
+        meta = {
+          description = "Archive exporter and daily sync for the personal BeatLeader mirror";
+          mainProgram = "plebleader-archive";
+        };
+      };
   in rec {
     packages = forAllSystems (system: let
       pkgs = import nixpkgs { inherit system; };
       pkg = mkPackage pkgs;
     in {
       plebsaber-stream = pkg;
+      plebleader-archive = mkArchiveCli pkgs;
       default = pkg;
     });