chore: add CODEOWNERS file

[dianab-cl]

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

[greptile-apps]

Greptile Summary

This PR updates the existing .github/CODEOWNERS file, replacing the previous global owners (@cometbft/engineering and @cometbft/devrel) with @cometbft/stack-team, and changes the glob pattern from * to **. Both * and ** function as catch-all patterns in GitHub CODEOWNERS, so the coverage is equivalent. Note: the PR title says "add CODEOWNERS file," but the file already existed — this is effectively an update/replacement.

Confidence Score: 5/5

Safe to merge — single-line administrative change with no logic or code impact.

The only change is updating the CODEOWNERS team assignment. Both the old (*) and new (**) patterns behave identically as catch-alls in GitHub CODEOWNERS, and the team name update is intentional. No code, logic, or functionality is affected.

No files require special attention.

Important Files Changed

Filename	Overview
.github/CODEOWNERS	Replaces global owners (@cometbft/engineering + @cometbft/devrel) with @cometbft/stack-team and updates glob pattern from * to **; both patterns are catch-alls in GitHub CODEOWNERS.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["All Repository Files\n(**)"] --> B["@cometbft/stack-team\n(new owner)"]
    C["Previous Owners"] -. removed .-> A
    C1["@cometbft/engineering"] --> C
    C2["@cometbft/devrel"] --> C

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