Migrate logging to structlog

[Copilot]

Fixes #651. The codebase was using standard library logging but team convention is structlog. This caused issues when structlog-style kwargs were used (see #650).

Changes:

• Replace logging with structlog in ext_theme_tags.py
• Add structlog to install_requires in setup.cfg

import structlog
log = structlog.get_logger(__name__)

Note: docs/docext.py intentionally unchanged—it uses Sphinx's logging wrapper, not stdlib.

Warning

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• https://api.github.com//advisories
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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Migrate logging to structlog</issue_title>
<issue_description>We hit an issue (#650) trying to use our normal structlog pattern, so we should swap all our logging here over to keep things the same. </issue_description>

<agent_instructions>We need to use the following structure to configure structlog:

import structlog
log = structlog.get_logger(__name__)
```</agent_instructions>

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

<comments>
</comments>

• Fixes Migrate logging to structlog #651

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[humitos]

Looks good to me 👍🏼