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 replaces the existing .github/CODEOWNERS file, changing the designated code owner team from @cosmos/sdk-core-dev to @cosmos/stack-team and updating the glob pattern from * to **. The removal of the explanatory comments is a minor cosmetic change; both * and ** effectively match all files in the repository for CODEOWNERS purposes.

Confidence Score: 5/5

Safe to merge — minimal config-only change with no logic impact.

The change is limited to a single config file with no code implications. Both * and ** cover all repository files in CODEOWNERS context, so the glob change is effectively a no-op. The only substantive change is the team name, which is an organizational decision outside the scope of code review.

No files require special attention.

Important Files Changed

Filename	Overview
.github/CODEOWNERS	Replaces catch-all owner from @cosmos/sdk-core-dev to @cosmos/stack-team and changes glob from * to **; both patterns match all repository files.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[PR Opened / Files Changed] --> B{GitHub evaluates CODEOWNERS}
    B --> C["Pattern: ** (matches all files)"]
    C --> D["Owner: @cosmos/stack-team"]
    D --> E[Review requested from stack-team]
    E --> F{Team approves?}
    F -- Yes --> G[PR can be merged]
    F -- No --> H[PR blocked / awaiting review]

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