refactor: enforce enum machine codes #18

Use owner enums for known codes; preserve wire values and unknown fallbacks.

Verified npm ci and verify: 379 tests, 5 lint checks, app and Storybook builds.

scripts/test-eslint.mjs

@@ -185,3 +185,27 @@ test("ESLint formatting preserves spaces around JSX text and interpolations", as
 	assert.equal(fixed.errorCount, 0);
 	assert.ok(fixed.output?.includes("Amount: {value} / {value}"));
 });
+
+// Single-use codes must be caught too; fixture literals remain independent wire assertions.
+test("machine codes require enum members without banning ordinary text or Prisma selects", async () => {
+	const eslint = new ESLint();
+	const filePath = "src/shared/api/problem-details.ts";
+	for (const code of ["export function check(code: string) { return code === \"one-off-code\"; }", "export const result = `MOEX_UNAVAILABLE`;", "export const result = { code: \"one-off-code\" };", "export const result = { \"errorCode\": \"one-off-code\" };", "export const result = { code: `dynamic-${Date.now()}` };", "export const result = \"MOEX_UNAVAILABLE\";", "export const result = [\"INSTRUMENT_ID_TYPE_FIGI\"];", "export const result = { OPERATION_TYPE_COUPON: \"income\" };"]) {
+		const [result] = await eslint.lintText(code, { filePath });
+		assert.equal(result.fatalErrorCount, 0, code);
+		assert.ok(result.messages.some(({ ruleId }) => ruleId === "no-restricted-syntax"), code);
+	}
+	for (const code of [
+		"enum Code { Unavailable = \"MOEX_UNAVAILABLE\" } export const result = { code: Code.Unavailable };",
+		"export const select = { code: true, errorCode: true };",
+		"export const label = \"Please try again\"; export const key = \"JWT_SECRET\";",
+	]) {
+		const [result] = await eslint.lintText(code, { filePath });
+		assert.equal(result.fatalErrorCount, 0, code);
+		assert.ok(result.messages.every(({ ruleId }) => ruleId !== "no-restricted-syntax"), code);
+	}
+	const [fixture] = await eslint.lintText("export const result = { code: \"MOEX_UNAVAILABLE\" };", { filePath: "src/shared/api/client.test.ts" });
+	assert.ok(fixture.messages.every(({ ruleId }) => ruleId !== "no-restricted-syntax"));
+	const [comparison] = await eslint.lintText("enum Code { Ready = \"ready\" } export function check(code: Code) { return code === \"ready\"; }", { filePath });
+	assert.ok(comparison.messages.some(({ ruleId }) => ruleId === "@typescript-eslint/no-unsafe-enum-comparison"));
+});