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 assigns @cosmos/stack-team as code owner for all files in the repository using the ** glob pattern. The change is minimal and straightforward, with no functional code modifications.

Confidence Score: 5/5

Safe to merge — single-line CODEOWNERS addition with no functional code changes.

The change is a single-line file addition using valid GitHub CODEOWNERS syntax. The ** pattern correctly matches all files, and @cosmos/stack-team follows the required @org/team-name format. No P0 or P1 issues identified.

No files require special attention.

Important Files Changed

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

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[PR Opened] --> B{Does changed path\nmatch CODEOWNERS rule?}
    B -- Yes, ** matches all files --> C[Request review from\n@cosmos/stack-team]
    C --> D[Team member approves]
    D --> E[PR eligible to merge]
    B -- No match --> F[No automatic\nreview requested]

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