一个需求，走到真正完成的 Task。

AIT first-task command recording — 2026-09-07
Actual command output. Absolute example roots are shortened to ~/ait-first-task.
The replay is edited for readability; playback is not an execution-time measurement.

Working directory: ~/ait-first-task
$ ait --version
ait 1.1.2
Exit code: 0

Working directory: ~/ait-first-task
$ node --test tests/baseline.test.mjs
✔ task titles preserve the input order and data (1.168458ms)
✔ the existing board title is unchanged (0.063583ms)
✔ the existing priorities are unchanged (0.046333ms)
ℹ tests 3
ℹ suites 0
ℹ pass 3
ℹ fail 0
ℹ cancelled 0
ℹ skipped 0
ℹ todo 0
ℹ duration_ms 63.568458
Exit code: 0

Working directory: ~/ait-first-task
$ ait init
Initialized empty AIT repository in ~/ait-first-task/.ait (plan=zh-Hant-TW/concise)
Exit code: 0

Working directory: ~/ait-first-task
$ ait config set --user-name 'AIT Demo'
ait config set
user-name: AIT Demo
Exit code: 0

Working directory: ~/ait-first-task
$ cat docs/sprints/open-tasks.md
# Open tasks [plan-ref: example/open-tasks]

## Intent
Add openTasks(tasks) to src/tasks.mjs. Return a new array of tasks whose done property is not true, preserving order and object references without mutating the input. Keep taskTitles unchanged.

## Constraints
Only edit this Task worktree. Do not edit checks/, remove tests, or add packages. The root agent executes this task without subagents.

## Acceptance
Add a focused regression test for done true, false, missing, empty input, preserved order and identity. Run node --test tests/*.test.mjs and node checks/first-task.mjs before Task finish; verify acceptance again in the original directory afterward.

- [ ] Add non-mutating openTasks and focused tests. [ref: open-tasks]
Exit code: 0

Working directory: ~/ait-first-task
$ ait task start --from 'docs/sprints/open-tasks.md#open-tasks' --intent 'Add openTasks without mutating input'
ait task start
task: LT-0001
title: Add non-mutating openTasks and focused tests
next: cd ~/ait-first-task/.ait-worktree-links/lt-0001
Exit code: 0

Working directory: ~/ait-first-task/.ait-worktree-links/lt-0001
$ node --test tests/baseline.test.mjs tests/open-tasks.test.mjs
✔ task titles preserve the input order and data (1.041042ms)
✔ the existing board title is unchanged (0.053041ms)
✔ the existing priorities are unchanged (0.048583ms)
✔ openTasks returns unfinished tasks without changing input or objects (1.224417ms)
ℹ tests 4
ℹ suites 0
ℹ pass 4
ℹ fail 0
ℹ cancelled 0
ℹ skipped 0
ℹ todo 0
ℹ duration_ms 63.11
Exit code: 0

Working directory: ~/ait-first-task/.ait-worktree-links/lt-0001
$ node checks/first-task.mjs
FIRST_TASK_ACCEPTED
Exit code: 0

Working directory: ~/ait-first-task/.ait-worktree-links/lt-0001
$ ait snapshot create LT-0001 --message 'Add non-mutating openTasks'
ait snapshot create
snapshot_id: SNP-0B558114ECDB
task_id: LT-0001
line_name: feature/lt-0001
parent_snapshot_id: SNP-2B43A5F97E11
message: Add non-mutating openTasks
Exit code: 0

Working directory: ~/ait-first-task/.ait-worktree-links/lt-0001
$ ait task finish LT-0001 --local
finished: LT-0001 -> main @ SNP-0B558114ECDB
closed: task, worktree, line, sprint
title: Add non-mutating openTasks and focused tests
Exit code: 0

Working directory: ~/ait-first-task
$ node --test tests/baseline.test.mjs tests/open-tasks.test.mjs
✔ task titles preserve the input order and data (0.987959ms)
✔ the existing board title is unchanged (0.050417ms)
✔ the existing priorities are unchanged (0.042292ms)
✔ openTasks returns unfinished tasks without changing input or objects (0.963875ms)
ℹ tests 4
ℹ suites 0
ℹ pass 4
ℹ fail 0
ℹ cancelled 0
ℹ skipped 0
ℹ todo 0
ℹ duration_ms 61.445542
Exit code: 0

Working directory: ~/ait-first-task
$ node checks/first-task.mjs
FIRST_TASK_ACCEPTED
Exit code: 0

Working directory: ~/ait-first-task
$ ait blame src/tasks.mjs --line 7
target: current line main
resolved snapshot: SNP-0B558114ECDB
path: src/tasks.mjs
blame parent: SNP-2B43A5F97E11
range: 7-7

7         SNP-0B558114ECDB task=LT-0001 confidence=durable_snapshot_binding
Exit code: 0

Implementation recorded in the completed Task:
// Small, existing behavior to preserve while adding your first feature.
export function taskTitles(tasks) {
  return tasks.map((task) => task.title);
}

export function openTasks(tasks) {
  return tasks.filter((task) => task.done !== true);
}

Bound sprint after Task finish:
# Open tasks [plan-ref: example/open-tasks]

## Intent
Add openTasks(tasks) to src/tasks.mjs. Return a new array of tasks whose done property is not true, preserving order and object references without mutating the input. Keep taskTitles unchanged.

## Constraints
Only edit this Task worktree. Do not edit checks/, remove tests, or add packages. The root agent executes this task without subagents.

## Acceptance
Add a focused regression test for done true, false, missing, empty input, preserved order and identity. Run node --test tests/*.test.mjs and node checks/first-task.mjs before Task finish; verify acceptance again in the original directory afterward.

- [x] Add non-mutating openTasks and focused tests. [ref: open-tasks]