fix: restore JSON config output and successful ship completion guidance

[chtnnh]

Problem

know-code config --json loses its flag during parser dispatch and emits human text. ship calls an exit-owning verification command, so successful verification exits before ship prints its final guidance.

Scope

Preserve config flags through dispatch and separate reusable verification logic from top-level process exit.

Acceptance criteria

• config --json emits parseable JSON.
• Successful ship prints its completion guidance and exits successfully.
• Top-level verify keeps its existing CLI exit behavior.
• Spawned CLI tests cover both regressions.