fix: Reformat code with Ruff 0.16.0

[tiran]

Pull Request Description

What

Reformat code with latest Ruff. Ruff 0.16.0 enables more checkers by default and can now format code in Markdown files, too.

Why

See https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md

• PR follows CONTRIBUTING.md guidelines

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Review details

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 773694bf-df51-4f4c-a977-f0387eb773fc

📥 Commits

Reviewing files that changed from the base of the PR and between 5cf74fb and 066ba78.

📒 Files selected for processing (5)

• docs/customization.md
• docs/http-retry.md
• docs/proposals/new-resolver-config.md
• docs/proposals/wheel-build-tag-hook.md
• src/fromager/packagesettings/_pbi.py

📝 Walkthrough

Walkthrough

Documentation code examples are reformatted across customization, HTTP retry, resolver configuration, and wheel build tag hook proposals. The changes adjust whitespace, line wrapping, and compactness while preserving shown logic and type contracts. The _plugin_module union annotation in PackageBuildInfo is reordered without changing its default value or runtime behavior.

Estimated code review effort: 1 (Trivial) | ~3 minutes

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title accurately summarizes the main change: reformatting code with Ruff 0.16.0.
Description check	✅ Passed	The description matches the changeset and explains the Ruff 0.16.0 formatting update.

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