fix: add mkdocstrings[python] to uvx invocations in docs.mk

[Copilot]

Summary

mkdocs-build and mkdocs-serve targets in docs.mk were missing --with "mkdocstrings[python]", causing API reference generation via mkdocstrings to silently fail.

Changes

• Added --with "mkdocstrings[python]" to the uvx invocation in mkdocs-build
• Added --with "mkdocstrings[python]" to the uvx invocation in mkdocs-serve

# both targets now include:
${UVX_BIN} --with "mkdocs-material<10.0" --with "pymdown-extensions>=10.0" --with "mkdocs<2.0" --with "mkdocstrings[python]" mkdocs build ...

Testing

• make test passes locally
• make fmt has been run
• New tests added (or explain why not needed): No tests needed — single-line Makefile flag addition

Checklist

• Commit messages follow the Conventional Commits format
• Documentation updated if behaviour changed
• make deptry passes (no unused or missing dependencies)

Original prompt

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This section details on the original issue you should resolve

<issue_title>fix: add mkdocstrings[python] to uvx invocations in docs.mk</issue_title>
<issue_description>## Background

Developed in tschm/jquantstats and ready to be pulled into the rhiza template.

Change

Both mkdocs-build and mkdocs-serve targets in docs.mk are missing --with "mkdocstrings[python]" in their uvx invocations. Without it, API reference generation via mkdocstrings does not work.

Add --with "mkdocstrings[python]" to both targets:

```makefile

mkdocs-build

${UVX_BIN} --with "mkdocs-material<10.0" --with "pymdown-extensions>=10.0" --with "mkdocs<2.0" --with "mkdocstrings[python]" mkdocs build ...

mkdocs-serve

${UVX_BIN} --with "mkdocs-material<10.0" --with "pymdown-extensions>=10.0" --with "mkdocs<2.0" --with "mkdocstrings[python]" mkdocs serve ...
```

Source commit: 51b3db2 in tschm/jquantstats</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes fix: add mkdocstrings[python] to uvx invocations in docs.mk #900

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