chore: add CODEOWNERS file

[dianab-cl]

Adds .github/CODEOWNERS to assign @cometbft/stack-team as code owners for all files.

[greptile-apps]

Greptile Summary

This PR adds a .github/CODEOWNERS file that designates @cometbft/stack-team as the required code owner for every file in the repository using the ** glob pattern. No logic changes are introduced.

Confidence Score: 5/5

Safe to merge — single-line config file with no logic changes.

The change is a trivial one-line config file. The ** glob is valid GitHub CODEOWNERS syntax that matches all files and directories. No functional code is modified.

No files require special attention.

Important Files Changed

Filename	Overview
.github/CODEOWNERS	Adds a new CODEOWNERS file assigning @cometbft/stack-team as owners for all files via the ** glob pattern.

Sequence Diagram

sequenceDiagram
    participant Dev as Developer
    participant GH as GitHub
    participant CO as CODEOWNERS
    participant Team as @cometbft/stack-team

    Dev->>GH: Open Pull Request
    GH->>CO: Evaluate changed file paths
    CO-->>GH: ** matches all files → @cometbft/stack-team
    GH->>Team: Request review
    Team-->>GH: Approve / Request Changes
    GH-->>Dev: Merge allowed (owner approval satisfied)

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