feat: auto-close Codex-owned sessions

[Beforerr]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
go/owner.go	66.66%	0 Missing and 1 partial ⚠️

Files with missing lines	Coverage Δ
go/owner.go	57.50% <66.66%> (+34.42%)	⬆️

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