feat: improve agents guidelines

[astandrik]

Collect all pull request comments from the past half across all branches for this repository.

Analyze these comments to identify recurring feedback patterns, best practices, and
common mistakes.

Output:

A concise, well-structured document containing:

Code Review Guidelines: Principles and rules reviewers typically emphasize.

Coding Standards & Requirements: Consistent technical rules (naming conventions,
formatting, testing, documentation, etc.).

Organize the output into sections, making it easy to share with the engineering team.

Use bullet points and examples when relevant.

Constraints:

Focus only on feedback actually present in the comments (don’t invent rules).

Avoid listing trivial or one-off remarks unless they indicate an important rule.

Ensure that the final document is actionable and ready to be adopted as team-wide
guidelines.

Filter useless comments
Also I think we need some code examples that these comments reference

In the end I want to integrate findings to CLAUDE.md, AGENTS.md and copilot instructions