docs: add gitcgr code graph badge

[vitali87]

Adds a gitcgr badge to the README showing code graph statistics for this repository.

Badge preview:

---

gitcgr.com visualizes any GitHub repo as an interactive code graph — just change hub to cgr in the URL.

Generated automatically by gitcgr.

[gemini-code-assist]

Summary of Changes

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This pull request enhances the repository's README.md by integrating a gitcgr badge. This addition provides a quick visual reference to the project's code graph statistics, offering an interactive way for users to explore the repository's structure and evolution directly from the README.

Highlights

• README Update: A new badge has been added to the README.md file, linking to the gitcgr code graph for the repository.

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[gemini-code-assist]

Code Review

This pull request adds a gitcgr code graph badge to README.md. I've suggested a minor formatting change to keep the new badge consistent with existing ones. Please also consider adding this badge to the translated README files (README.zh-CN.md, README.ru.md, README.ja.md) for consistency across all documentation.

[gemini-code-assist]

For consistency with the other badges in this file, which are all on a single line, it's recommended to format this new badge's HTML on a single line as well. This improves readability and maintains a consistent style throughout the document.

Suggested change

	<a href="https://gitcgr.com/nearai/ironclaw">
	<img src="https://gitcgr.com/badge/nearai/ironclaw.svg" alt="gitcgr" />
	</a>
	<a href="https://gitcgr.com/nearai/ironclaw"><img src="https://gitcgr.com/badge/nearai/ironclaw.svg" alt="gitcgr" /></a>