Refactor codeowners config/generation

[mcmire]

Explanation

In a previous commit (4a8e09d) we added a configuration file, codeowners.ts, which was intended to help contributors define codeowners for packages more easily. However, in an effort to preserve existing grouping and sorting within .github/CODEOWNERS as much as possible, we were forced to include explicit generation logic in the configuration file, which made it less maintainable than we'd liked.

This commit changes codeowners.ts so that now all it contains is an exported configuration object, and the aforementioned logic to generate the CODEOWNERS file has been simplified. All packages and teams are now alphabetized, and the order of sections within CODEOWNERS is predetermined. For rare cases where customization is needed, an overrides property within the configuration file is available for use.

References

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

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Note

Medium Risk
Regenerating CODEOWNERS changes rule order and file layout, which can shift GitHub review requests even when team assignments are preserved; verify overrides still win for nested paths like wallet initialization.

Overview
codeowners.ts is now a declarative config (packages + overrides) instead of exporting hand-built sections and inline generation helpers. Package→team mappings and optional initializationPath values are unchanged in intent; generation logic moved into scripts/manage-codeowners/ (assemble.ts, render.ts, generate.ts) with unit tests.

The regenerated .github/CODEOWNERS drops team-grouped sections in favor of a fixed layout: alphabetized Packages blocks (each package gets directory ownership, release files with @MetaMask/core-platform co-ownership, and wallet init paths under the wallet subsection), then an Overrides section (.github/, eth-json-rpc-middleware paths). Owner lists are sorted for consistent output. The CLI prelude is shorter; main.ts calls generateCodeownersFileContent(config).

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[mcmire]

The packages property in this configuration object should be equivalent to PACKAGES from before. overrides is a new property and replaced the custom rules that were spread out between buildFirstSection and buildJointTeamOwnershipSection.