Wagtail docs version detection fails if wagtail-cli is installed as tool

Issue summary

If I install the wagtail cli as a tool as per the instructions

uv tool install wagtail-cli

then wt docs is not able to detect the wagtail version of the project I am in. However wt --version is able to correctly determine the wagtail version of the current project.

The docs command tries to detect the wagtail version with importlib

https://github.com/wagtail/wagtail-cli/blob/190d1bee2dad91f79336c3efe68ddbab7f14989d/src/wagtail_cli/docs.py#L55-L61

The --version command detects the wagtail version by executing wagtail

https://github.com/wagtail/wagtail-cli/blob/190d1bee2dad91f79336c3efe68ddbab7f14989d/src/wagtail_cli/cli/main.py#L216-L224

Steps to reproduce

1. Install the wagtail-cli as a tool
2. In a project with wagtail installed, activate the project virtual environment
3. Run wt --version and observe that the current wagtail version is printed
4. Run queries with wt docs and note that all requests go to stable

Additional information

No response

Can be reproduced

Not confirmed

Technical details

$ wt --version
wagtail-cli 0.2.0
Wagtail: You are using Wagtail 7.4.3
Django: 6.0.8

Working on this

If you would like to contribute to this issue, follow these steps:

• Confirm that the issue is reproducible, either on a fresh Wagtail project or the bakerydemo.
• Once confirmed, view our contributing guidelines, add a comment to the issue once you're ready to start.

Reproduce the problem with uv tool install wagtail-cli in a Wagtail project, then compare src/wagtail_cli/docs.py lines 55-61 with the version handling in src/wagtail_cli/cli/main.py lines 216-224. Confirm that wt docs detects the current project’s Wagtail version rather than routing requests to stable.