fix(recipe): unescape escaped quotes and backslashes in quoted values

packages/recipe/src/parser.ts

@@ -187,7 +187,19 @@ function parseValue(sourceName: string, text: string, offset: number): Canonical
     (value.startsWith('"') && value.endsWith('"'))
     || (value.startsWith("'") && value.endsWith("'"))
   ) {
-    return value.slice(1, -1);
+    const quote = value[0] as "\"" | "'";
+    let unescaped = "";
+    for (let index = 1; index < value.length - 1; index += 1) {
+      const character = value[index]!;
+      const next = value[index + 1];
+      if (character === "\\" && (next === quote || next === "\\")) {
+        unescaped += next;
+        index += 1;
+        continue;
+      }
+      unescaped += character;
+    }
+    return unescaped;
   }
   return value;
 }

packages/recipe/test/source-closure.test.ts

@@ -313,6 +313,23 @@ test("quoted Recipe values may contain Prompt punctuation without changing SVS s
   assert.equal(sheet.recipes[0]?.value.properties.text, "first; second } /* literal */");
 });
 
+test("quoted Recipe values unescape the escaped quote and backslash the scanners honor", () => {
+  const sheet = parseRecipe(
+    "escape.svs",
+    `<sheet version="1">
+  caption.host {
+    text: "He said \\"hi\\" twice";
+    note: "path C:\\\\caps ends here";
+    aside: 'It\\'s minimal';
+  }
+</sheet>`,
+  );
+  const properties = sheet.recipes[0]?.value.properties;
+  assert.equal(properties.text, 'He said "hi" twice');
+  assert.equal(properties.note, "path C:\\caps ends here");
+  assert.equal(properties.aside, "It's minimal");
+});
+
 test("quoted Recipe values may contain the sheet closing text without ending the document", () => {
   const sheet = parseRecipe(
     "literal-close.svs",