Parallel Execution

By default dependencies run one after another in declaration order. Set parallel = true to run them concurrently; the task starts after all of them finish (fan-out / fan-in).

## ci

```meta
depends = ["lint", "test", "build"]
parallel = true
```

```bash
echo "all checks passed"
```

• Only real dependency edges constrain ordering: a task starts as soon as its own dependencies are done.
• Output is prefixed with the task name (for example lint │ output); each task reports ✔/✘ with its duration.
• The first failure aborts the run: running tasks (and the processes they started) are stopped. -k/--keep-going lets independent tasks finish; dependents of a failed task are not run.
• --parallel forces concurrency regardless of the file; -j N/--jobs N caps concurrent tasks (-j 1 is sequential). Default: number of CPUs.
• stdin is closed for tasks in parallel runs; keep interactive tasks sequential. Dry-run is always sequential.