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 updates the existing .github/CODEOWNERS file — it does not add a new one as the description states — replacing the prior owner team @cosmos/sdk-core-dev with @cosmos/stack-team and removing the # Primary repo maintainers comment.

Confidence Score: 5/5

Safe to merge — single-line config change with no code impact.

Only finding is a P2 style note about an inaccurate PR description; no logic, security, or correctness issues present.

No files require special attention.

Vulnerabilities

No security concerns identified.

Important Files Changed

Filename	Overview
.github/CODEOWNERS	Replaces @cosmos/sdk-core-dev with @cosmos/stack-team as the wildcard owner for all files; removes the descriptive comment header.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[PR or Push to cosmos/iavl] --> B{Files changed?}
    B -->|any file matches *| C[GitHub checks CODEOWNERS]
    C --> D[Requires review from @cosmos/stack-team]
    D --> E{Approval received?}
    E -->|Yes| F[PR can be merged]
    E -->|No| G[PR blocked until team member approves]

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