chore: dramatically simplify codeowners

[joroshiba]

Summary

Project in maintenance mode, dramatically simplifying the codeowners file.

[greptile-apps]

Greptile Overview

Summary

This PR dramatically simplifies the CODEOWNERS file as part of transitioning the Astria project into maintenance mode. The change removes granular component-level ownership assignments for 25+ individual components (such as astria-auctioneer, astria-bridge-contracts, etc.) and consolidates them into broader team-based ownership patterns.

The key structural changes include:

• Default ownership: All files now default to both @joroshiba and @astriaorg/rust-reviewers
• Workflow consolidation: GitHub workflow files are now owned by @astriaorg/rust-reviewers instead of individual users
• Team-based specialization: Maintains specialized team ownership for infrastructure (@astriaorg/infra), engineering (@astriaorg/engineering), and API (@astriaorg/api-reviewers) components
• Rust toolchain simplification: Removes individual user assignments for core Rust files (Cargo.toml, rust-toolchain, .cargo/, etc.)

This change aligns with the project's maintenance mode transition where consistent team-based review coverage becomes more important than specialized individual component expertise. The dual assignment of @joroshiba and @astriaorg/rust-reviewers provides redundancy with a primary maintainer and team backup coverage, ensuring sustainable review processes during the maintenance phase.

Important Files Changed

Changed Files

Filename	Score	Overview
CODEOWNERS	5/5	Simplified from component-specific ownership to team-based ownership structure for maintenance mode

Confidence score: 5/5

• This PR is safe to merge with minimal risk as it only modifies code ownership assignments without affecting any functional code
• Score reflects that CODEOWNERS changes are administrative in nature and cannot break production systems or introduce bugs
• No files require special attention as this is purely an organizational change

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