Show git branch in default footer

[nightt5879]

Summary

• Add the existing Git branch status item to the default footer so local branch info is visible without first configuring /statusline.
• Use the existing workspace context cache for footer branch rendering so the default footer does not run git synchronously on each draw.
• Harden the git-repo footer test helper against global commit signing config.

Testing

• cargo fmt --all -- --check
• cargo clippy --workspace --all-targets --all-features
  • Passed with existing clippy warnings outside this patch.
• cargo test -p codewhale-tui --bin codewhale-tui --all-features default_footer
• cargo test -p codewhale-tui --bin codewhale-tui --all-features render_footer_from_git_branch_item_renders_workspace_branch
• GitHub Actions CI
  • Lint, Version drift, Test (ubuntu-latest), Test (macos-latest), Test (windows-latest), npm wrapper smoke, GitGuardian, and Greptile all passed.

Checklist

• Updated docs or comments as needed
• Added or updated tests where relevant
• Verified TUI behavior manually if UI changes
  • Covered by focused footer rendering tests in this non-interactive Windows session.

Closes #2341

[gemini-code-assist]

Code Review

This pull request adds the GitBranch status item to the default TUI footer configuration. It also updates the test suite to disable GPG signing for test git commits, asserts that the default footer contains the new GitBranch item, and adds a test verifying that the workspace branch is correctly rendered in the default footer. There are no review comments, and I have no additional feedback to provide.

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 56d2e74b0d

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[nightt5879]

Ready for review now. Follow-up commit 834bfeb addresses the Codex P2 feedback by reading the cached workspace context instead of running git from footer rendering. All CI checks are passing, including Windows, and the inline review thread has a direct fix reply.

[Hmbown]

oooh thank you. let me think about how to fit this without overwhelming the ui/ux. I think there might be a way to get this on the sidebar