fix: reject partial numeric CLI options

src/cli/program/helpers.test.ts

@@ -3,6 +3,7 @@ import { describe, expect, it } from "vitest";
 import {
   collectOption,
   parsePositiveIntOrUndefined,
+  parseStrictPositiveIntOption,
   parseStrictPositiveIntOrUndefined,
   resolveActionArgs,
   resolveCommandOptionArgs,
@@ -53,6 +54,13 @@ describe("program helpers", () => {
     expect(parseStrictPositiveIntOrUndefined(value)).toBe(expected);
   });
 
+  it("parseStrictPositiveIntOption rejects partial numeric strings", () => {
+    expect(parseStrictPositiveIntOption("10", "--limit")).toBe(10);
+    expect(() => parseStrictPositiveIntOption("10ms", "--limit")).toThrow(
+      "--limit must be a positive integer.",
+    );
+  });
+
   it("resolveActionArgs returns args when command has arg array", () => {
     const command = new Command();
     (command as Command & { args?: string[] }).args = ["one", "two"];