Switch CODEOWNERS from sip to cli team

[jeremy]

Reduces review noise for the sip team by routing ownership to the cli team.

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Summary by cubic

Switch CODEOWNERS from @basecamp/sip to @basecamp/cli (all files and .github/workflows/) and fix SA5011 nil-pointer warnings in tests.

^{Written for commit e1cc777. Summary will update on new commits.}

[github-actions]

Sensitive Change Detection (shadow mode)

This PR modifies control-plane files:

• .github/CODEOWNERS

Shadow mode — this check is informational only. When activated, changes to these paths will require approval from a maintainer.

[cubic-dev-ai]

No issues found across 1 file

[Copilot]

Pull request overview

This PR updates repository ownership rules to route CODEOWNERS review requests from the @basecamp/sip team to the @basecamp/cli team, reducing review noise for sip.

Changes:

• Update the default CODEOWNERS entry (*) to @basecamp/cli.
• Update .github/workflows/ ownership to @basecamp/cli.

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[Copilot]

Pull request overview

Routes automatic review requests away from @basecamp/sip and toward @basecamp/cli by updating repository CODEOWNERS, reducing SIP review noise.

Tip

If you aren't ready for review, convert to a draft PR.
Click "Convert to draft" or run gh pr ready --undo.
Click "Ready for review" or run gh pr ready to reengage.

Changes:

• Update .github/CODEOWNERS to assign ownership to @basecamp/cli (including workflow files).
• Add explicit return statements after t.Fatal(...) in a few TUI tests.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
internal/tui/tui_test.go	Adds explicit returns after t.Fatal in nil-guarded test branches.
internal/tui/debug_test.go	Adds explicit return after t.Fatal in a nil-guarded test branch.
.github/CODEOWNERS	Switches code ownership from @basecamp/sip to @basecamp/cli.

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