nng: drop obsolete clippy::empty_enum allow

[flxo]

Remove the #![allow(clippy::empty_enum)] suppression from nng/src/lib.rs.

The comment referenced RFC 1861 (extern types) and RFC 1216 (C-compatible enums), both of which have long since been resolved. The lint no longer fires on this codebase, making the allow unnecessary and event produces a clippy warning.

Summary by CodeRabbit

• Chores
  • Updated internal code quality configurations.

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Note: This release contains no user-facing changes or new features.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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📝 Walkthrough

Walkthrough

A crate-level Clippy lint attribute permitting the empty_enum lint was removed from the library's root file. No functional or API changes were introduced.

Changes

Cohort / File(s)	Summary
Lint Configuration nng/src/lib.rs	Removed crate-level #![allow(clippy::empty_enum)] attribute.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

A tiny lint flew away with the breeze,
One line removed with such ease,
The code hops along, clean and bright,
Configuration's just right! 🐰✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: removing an obsolete Clippy allow attribute for empty_enum from the nng crate.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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