dask-worker not found on the CLI in 2026.6.0

Describe the issue: The `dask-worker` CLI command is not longer present and then causes an error with the `.adaptive() `function not being able to run at all for the `ECSCluster` class

Minimal Complete Verifiable Example:

1. install dask@2026.6.0
2. run dask-worker in the terminal
3. Terminal will show an error with the command not being available

Anything else we need to know?: The command was present in the 2026.3.0 version and the `.adaptive()` works on that version

Dask version: 2026.6.0
Python version: 3.13.12
Operating System: WSL Ubuntu 22.04.5
Install method (conda, pip, source): poetry

Start by comparing the dask-worker command and ECSCluster adaptive path between versions 2026.3.0 and 2026.6.0, using the reported installation steps in WSL Ubuntu. Trace where the CLI entry point is defined and how ECSCluster invokes it; done means dask-worker is available again and ECSCluster.adaptive() runs successfully on 2026.6.0.

Written by the indexing model from the issue text.