`--single-step <stepname>` plus `--help` to list the inputs doesn't produce the correct results

and `--single-step --make-template` only documents the overall workflow inputs

```
$ cwltool --single-step data_selection https://github.com/cnherrera/CWL_Workflow_DIADEM_use_case/raw/81e468181639c02c286ebef2826c4998b9a67cfd/work_test.cwl --help
INFO /home/michael/src/2026-06-OPTIMADE/env/bin/cwltool 3.2.20260413085819
WARNING https://github.com/cnherrera/CWL_Workflow_DIADEM_use_case/raw/81e468181639c02c286ebef2826c4998b9a67cfd/data_selection.cwl:25:3: object id 'https://github.com/cnherrera/CWL_Workflow_DIADEM_use_case/raw/81e468181639c02c286ebef2826c4998b9a67cfd/data_selection.cwl#attributes' previously defined
WARNING https://github.com/cnherrera/CWL_Workflow_DIADEM_use_case/raw/81e468181639c02c286ebef2826c4998b9a67cfd/data_selection.cwl:25:3: object id 'https://github.com/cnherrera/CWL_Workflow_DIADEM_use_case/raw/81e468181639c02c286ebef2826c4998b9a67cfd/data_selection.cwl#attributes' previously defined
usage: https://github.com/cnherrera/CWL_Workflow_DIADEM_use_case/raw/81e468181639c02c286ebef2826c4998b9a67cfd/work_test.cwl [-h] [job_order]

positional arguments:
job_order Job input json file

options:
-h, --help show this help message and exit
```

```
$ cwltool --single-step data_selection --make-template https://github.com/cnherrera/CWL_Workflow_DIADEM_use_case/raw/81e468181639c02c286ebef2826c4998b9a67cfd/work_test.cwl
INFO /home/michael/src/2026-06-OPTIMADE/env/bin/cwltool 3.2.20260413085819
WARNING https://github.com/cnherrera/CWL_Workflow_DIADEM_use_case/raw/81e468181639c02c286ebef2826c4998b9a67cfd/data_selection.cwl:25:3: object id 'https://github.com/cnherrera/CWL_Workflow_DIADEM_use_case/raw/81e468181639c02c286ebef2826c4998b9a67cfd/data_selection.cwl#attributes' previously defined
output_file: a_string # type 'string'
hpc_resource: a_string # type 'string'
database_name: a_string # type 'string'
conditions: a_string # type 'string'
attributes_to_simulate: # array of type 'string'
- a_string
attributes_to_extract: # array of type 'string'
- a_string
```

Start by reproducing the two cwltool commands in the issue and trace the CLI handling of --single-step with --help and --make-template. The fix is done when both commands list and template the selected step's inputs rather than only the overall workflow inputs.

Written by the indexing model from the issue text.