Simplify CODEOWNERS rules

[Eduard van Valkenburg (eavanvalkenburg)]

Motivation & Context

The current CODEOWNERS file contains many package- and project-specific overrides that are difficult to maintain. A small set of top-level rules makes ownership clearer while preserving distinct reviewer groups for Python and .NET.

Description & Review Guide

• What are the major changes? Replaced the package-level rules with a default catch-all rule and replacement rules for the Python and .NET trees.
• What is the impact of these changes? Documentation and other paths outside Python and .NET are owned by all ten listed maintainers. Python paths are owned by the five shared maintainers plus Jose, Tao, and Giles. .NET paths are owned by the five shared maintainers plus Vincent and Peter. Because the last matching CODEOWNERS pattern wins, these groups replace rather than duplicate the default owners.
• What do you want reviewers to focus on? Verify that the three distinct owner groups and last-match behavior reflect the intended review coverage.

Related Issue

No linked issue. This is a maintainer-requested repository configuration update.

Contribution Checklist

• The code builds clean without any errors or warnings
• All unit tests pass, and I have added new tests where possible
• The PR follows the Contribution Guidelines
• This PR is linked to an issue and there is no other open PR for this issue (see Related Issue above).
• This is not a breaking change. If it is a breaking change, add the breaking change label (or add "[BREAKING]" to the title prefix, before or after any language prefix) — a workflow keeps the label and title prefix in sync automatically.

[Copilot]

🟡 Changes recommended

The language rules conflict with the documented repository-wide ownership model.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

Simplifies CODEOWNERS into repository-wide, Python, and .NET ownership groups.

Changes:

• Removes package/project-specific overrides.
• Adds catch-all and language-level rules.
• Documents last-match behavior.

File summaries

File	Description
.github/CODEOWNERS	Consolidates ownership rules.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 1
• Review effort level: Balanced

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[github-actions]

MAF Automated Review — Iteration 1

Result: No findings
Scope: full PR (1 commit(s)): 4c01602a0693
Model: gpt-5.6-sol-fast

Overview

The PR replaces package-level ownership rules with complete catch-all coverage and explicit Python and .NET owner groups. The language rules retain every owner from the former core-language groups and preserve five shared fallback reviewers across all paths. No concrete Critical, High, or Medium defect remains after reconciling the proposed risks with the stated ownership model and repository evidence.

Reviewed the supplied pull-request change set across correctness, security/reliability, architecture, and failure behavior.
No publishable findings remained after source verification for this scope.