Configured body_length_limit is ignored by cz commit #2093

Description

The body_length_limit setting is ignored by cz commit when it is configured
in a project configuration file. Passing --body-length-limit explicitly works.

The CLI parser includes body_length_limit=None in the command arguments when
the option is omitted. Commit._wrap_body() uses dict.get(key, default), so
that None masks the configured value instead of falling back to it.

Steps to reproduce

1. Configure Commitizen with:

   [tool.commitizen]
   body_length_limit = 80

2. Run cz commit.

3. Enter a commit body containing a line longer than 80 characters.

4. Complete the commit and inspect its message.

Current behavior

The body line remains longer than 80 characters. The configured limit is only
applied when --body-length-limit 80 is passed explicitly.

Desired behavior

When the CLI option is omitted, cz commit should use the configured
body_length_limit. An explicit --body-length-limit 0 should continue to
disable wrapping.

Screenshots

Not applicable.

Environment

Commitizen Version: 4.19.0
Python Version: 3.12.3 (main, Aug 31 2026, 10:18:26) [GCC 13.3.0]
Operating System: Linux