docs(agents): add rules for DCO sign-off, .test TLD, backtick formatting, and Sphinx version directives

[tiran]

Pull Request Description

What

• enforce git commit --signoff for DCO sign-off (agent was sometimes ignoring the rule)
• use .test TLD instead of example.com in tests and examples
• use single backticks in markdown/commit messages, double backticks in .rst
• use Sphinx versionadded/versionremoved/versionchanged directives for user-facing changes

Why

Agent was sometimes ignoring the --signoff rule. I have to remind the agent of .test TLD, backtickets and Sphinx directives regularly.

• PR follows CONTRIBUTING.md guidelines

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

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Run ID: f61df384-d99b-426e-be95-da2a9c12a0bf

📥 Commits

Reviewing files that changed from the base of the PR and between 7b10135 and dddf5df.

📒 Files selected for processing (1)

• AGENTS.md

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📝 Walkthrough

Walkthrough

This PR updates AGENTS.md to strengthen guidance for AI agents and developers. Line 18 adds an explicit requirement to use git commit --signoff. Lines 97–124 expand the "Code Patterns" section with new subsections: URL .test TLD usage for test domains, Arrange/Act/Assert testing structure, documentation and docstring formatting standards, and a more comprehensive "Commit Messages" section that details DCO sign-off and attribution trailer requirements.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly and specifically summarizes the main changes: adding DCO sign-off rules, .test TLD usage, backtick formatting conventions, and Sphinx directives to the agents documentation.
Description check	✅ Passed	The description is directly related to the changeset, detailing the four specific documentation updates and explaining the rationale for each change.
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.

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