chore: add CODEOWNERS file

[dianab-cl]

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

[greptile-apps]

Greptile Summary

This PR adds a .github/CODEOWNERS file that designates @cosmos/stack-team as the required reviewer for all files in the repository using the ** glob pattern.

Confidence Score: 5/5

Safe to merge — single-line config file with valid CODEOWNERS syntax and no logic changes.

The change is a straightforward addition of a standard GitHub CODEOWNERS file. The ** pattern is valid and matches all files; no code paths are affected.

No files require special attention.

Important Files Changed

Filename	Overview
.github/CODEOWNERS	Adds a CODEOWNERS file assigning @cosmos/stack-team as code owner for all files via the ** pattern — valid GitHub CODEOWNERS syntax.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Pull Request Opened] --> B{Files changed match\n CODEOWNERS pattern?}
    B -- "** matches all files" --> C[GitHub requests review\nfrom @cosmos/stack-team]
    C --> D{Team member\napproves PR?}
    D -- Yes --> E[PR can be merged]
    D -- No --> F[PR blocked until\napproval received]

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