docs: add OpenSSF Best Practices passing badge to README

[Fieldnote-Echo]

ordvec earned the OpenSSF Best Practices passing badge (project 12977, 100%). This adds the badge to the README badge row, next to the OpenSSF Scorecard badge.

Embed is the project's official badge URL:
[![OpenSSF Best Practices](https://www.bestpractices.dev/projects/12977/badge)](https://www.bestpractices.dev/projects/12977)

[qodo-code-review]

Review Summary by Qodo

Add OpenSSF Best Practices badge to README

📝 Documentation

Walkthroughs

Description

• Add OpenSSF Best Practices badge to README
• Badge links to project 12977 with 100% passing status
• Positioned alongside existing OpenSSF Scorecard badge

Diagram

flowchart LR
  README["README.md"]
  BADGES["Badge Row"]
  BEST_PRACTICES["OpenSSF Best Practices Badge"]
  README -- "add badge" --> BADGES
  BADGES -- "includes" --> BEST_PRACTICES

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File Changes

1. README.md 📝 Documentation +1/-0

Add OpenSSF Best Practices badge link

• Added OpenSSF Best Practices badge markdown link
• Badge references project 12977 with 100% passing status
• Positioned in badge row after OpenSSF Scorecard badge

README.md

---

[qodo-code-review]

Code Review by Qodo

🐞 Bugs (0) 📘 Rule violations (0) 📎 Requirement gaps (0)

Great, no issues found!

Qodo reviewed your code and found no material issues that require review

[gemini-code-assist]

Code Review

This pull request updates the README.md file to include an OpenSSF Best Practices badge. There are no review comments, and I have no feedback to provide.