feat: complete advanced Sudoku workbench

tests/formats/fpuzzles.test.ts

@@ -115,6 +115,63 @@ describe("fpuzzles interoperability", () => {
     expect(imported.constraints).toEqual(expect.arrayContaining(expected));
   });
 
+  it("round-trips the registered expansion-pack constraints", () => {
+    const solution = [
+      1, 2, 3, 4, 5, 6, 7, 8, 9, 4, 5, 6, 7, 8, 9, 1, 2, 3, 7, 8, 9, 1, 2, 3, 4,
+      5, 6, 2, 3, 4, 5, 6, 7, 8, 9, 1, 5, 6, 7, 8, 9, 1, 2, 3, 4, 8, 9, 1, 2, 3,
+      4, 5, 6, 7, 3, 4, 5, 6, 7, 8, 9, 1, 2, 6, 7, 8, 9, 1, 2, 3, 4, 5, 9, 1, 2,
+      3, 4, 5, 6, 7, 8,
+    ];
+    const source: SudokuDocument = {
+      schema: SUDOKU_DOCUMENT_SCHEMA,
+      version: 1,
+      size: 9,
+      givens: Array<number>(81).fill(0),
+      solution,
+      constraints: [
+        { type: "disjoint-groups" },
+        { type: "minimum", cell: 0 },
+        { type: "odd", cell: 1 },
+        { type: "even", cell: 2 },
+        {
+          type: "little-killer",
+          side: "top",
+          index: 0,
+          direction: "down-right",
+          sum: 45,
+        },
+        { type: "sandwich", side: "left", index: 0, sum: 20 },
+        { type: "between-line", cells: [0, 1, 2] },
+        { type: "german-whisper", cells: [9, 10], minimumDifference: 4 },
+        { type: "region-sum-line", cells: [18, 19, 20, 21] },
+        { type: "clone", cells: [27, 28], cloneCells: [36, 37] },
+        {
+          type: "extra-region",
+          cells: [0, 10, 20, 30, 40, 50, 60, 70, 80],
+        },
+        { type: "modular-line", cells: [45, 46, 47] },
+        { type: "entropic-line", cells: [54, 55, 56] },
+        { type: "zipper-line", cells: [63, 64, 65] },
+        { type: "double-arrow", cells: [72, 73, 74] },
+        { type: "indexer", kind: "row", cell: 3 },
+        { type: "indexer", kind: "column", cell: 4 },
+        { type: "indexer", kind: "box", cell: 5 },
+        { type: "fog", lights: [0, 40], revealRadius: 1 },
+      ],
+    };
+
+    const imported = parseFpuzzles(exportFpuzzles(source));
+    expect(imported.constraints).toEqual(
+      expect.arrayContaining(
+        source.constraints.map((constraint) =>
+          constraint.type === "fog"
+            ? { type: "fog", lights: constraint.lights }
+            : constraint,
+        ),
+      ),
+    );
+  });
+
   it("recognizes server-only short puzzle IDs without making a request", () => {
     expect(() => importFpuzzles("https://sudokupad.app/abc123")).toThrowError(
       NetworkPuzzleIdError,
@@ -220,9 +277,9 @@ describe("fpuzzles interoperability", () => {
       parseFpuzzles({
         size: 9,
         grid: emptyGrid(),
-        odd: [{ cell: "R1C1" }],
+        nabner: [{ lines: [["R1C1", "R1C2"]] }],
       }),
-    ).toThrow(/odd cells.*silently weakening/u);
+    ).toThrow(/Nabner lines.*silently weakening/u);
     expect(() =>
       parseFpuzzles({
         size: 9,