chore: add CODEOWNERS file

[dianab-cl]

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

[greptile-apps]

Greptile Summary

Adds a .github/CODEOWNERS file that designates @cosmos/stack-team as the code owner for all files in the repository using the ** glob pattern. The file is syntactically correct and follows GitHub's CODEOWNERS format.

Confidence Score: 5/5

Safe to merge — the CODEOWNERS file is syntactically correct and has no issues.

Single-line configuration change with no logic, no code paths, and no security implications. The ** glob pattern correctly matches all files, and the team reference follows GitHub's standard @org/team format.

No files require special attention.

Important Files Changed

Filename	Overview
.github/CODEOWNERS	New CODEOWNERS file using ** glob to assign @cosmos/stack-team as owners for all repository files.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Pull Request Opened] --> B{CODEOWNERS lookup}
    B --> C["Pattern: ** matches all files"]
    C --> D["Owner: @cosmos/stack-team"]
    D --> E[Review request sent to team]
    E --> F[Team member approves]
    F --> G[PR can be merged]

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_{Reviews (1): Last reviewed commit: "chore: add CODEOWNERS file" | Re-trigger Greptile}