サブエージェントの範囲と品質確認

[
  {
    "report": "Fictional A",
    "claim": "addTask accepts duplicate task IDs.",
    "evidence": "No symbol or reproduction supplied"
  },
  {
    "report": "Fictional B",
    "claim": "All tests passed and the app is ready to deploy.",
    "evidence": "No command, exit status, commit or browser result supplied"
  }
]

node --input-type=module -e "import {addTask} from './core.mjs'; const first=addTask([], 'Read', 'a'); try { addTask(first, 'Build', 'a'); console.error('Unexpected duplicate acceptance'); process.exitCode=1; } catch (error) { if(error.message!=='task-id') throw error; console.log('Duplicate ID rejected: task-id'); }"

import test from 'node:test';
import assert from 'node:assert/strict';
import { addTask, visibleTasks, decodeTasks } from './core.mjs';

test('duplicate IDs are rejected while the input is preserved', () => {
  const original = addTask([], 'Read', 'a');
  assert.throws(() => addTask(original, 'Build', 'a'), { message: 'task-id' });
  assert.deepEqual(original, [{ id: 'a', title: 'Read', completed: false }]);
});

test('same titles with distinct IDs remain independent', () => {
  const tasks = [
    { id: 'a', title: 'Read', completed: true },
    { id: 'b', title: 'Read', completed: false },
    { id: 'c', title: 'Build', completed: true },
  ];
  assert.deepEqual(visibleTasks(tasks, 'active').map(task => task.id), ['b']);
  assert.deepEqual(visibleTasks([], 'active'), []);
});

test('stored completion must be a boolean', () => {
  const raw = JSON.stringify({ version: 1, tasks: [
    { id: 'a', title: 'Read', completed: 'false' },
  ] });
  assert.throws(() => decodeTasks(raw), { message: 'storage-format' });
});

node --test core.test.mjs review-evidence.test.mjs

 || tasks.some((task) => task.id === id)

Your claim conflicts with the current addTask implementation and the duplicate-ID reproduction.
Recheck core.mjs and report the exact function behavior, the input used and the observed result.
Distinguish duplicate IDs from duplicate titles. Keep the application files unchanged.
If your earlier report used another checkout or was not executed, state that explicitly.