docs(mvp2): mark MVP-2-07 closed in tables

[Alexendros]

Summary

• Set MVP-2-07 to closed in next-issues and backlog after tag implementation-baseline-mvp2.

Test plan

• Status rows match closing rule text

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Note

Low Risk
Documentation-only status updates with no runtime, security, or data-path impact.

Overview
Marks MVP-2-07 (implementation-baseline-mvp2 release tag) as closed in the MVP-2 issue tables in backlog.md and next-issues.md, replacing the previous planned state so delivery docs match the emitted baseline.

Both tables also get minor Estado column alignment tweaks (spacing) with no semantic change to other rows.

^{Reviewed by Cursor Bugbot for commit 4d71881. Configure here.}

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(requestId: 06a8591c-9d65-4a9e-a0be-7428ce4f28ac)