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 modifies the existing .github/CODEOWNERS file, replacing @cosmos/sdk-core-dev as the repository-wide code owner with @cosmos/stack-team. All explanatory comments are also removed. Note: the PR title says "add CODEOWNERS file" but the file already existed — this is effectively a team ownership transfer.

Confidence Score: 5/5

This PR is safe to merge — it's a one-line ownership reassignment with no functional code changes.

Single-file, single-line change with no logic, no runtime impact, and no security implications. All findings are informational only.

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; removes all inline comments. No syntax issues.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["Any file change in cosmos/gogoproto"] --> B{"CODEOWNERS rule\n'* @cosmos/stack-team'"}
    B --> C["@cosmos/stack-team\nrequested as reviewer"]
    C --> D["PR approved by team member?"]
    D -- Yes --> E["Merge allowed"]
    D -- No --> F["Merge blocked"]

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