I have to clarify this part though:
>>”Postsalvation repentance? Yes”
One can enter Heaven with sins they do not repent of? Is there a limit here, either qualitative or quantitative?
No. No sin can enter heaven. When this body dies, the sin is gone. The new nature is without sin and can therefore enter the presence of God. That explains Romans 7&8.
For the unbeliever, there is no new nature, so when the body dies, the sin condemns them.
For the believer, the death of the body is counted as already having happened.
Galatians 2:20 I have been crucified with Christ. It is no longer I who live, but Christ who lives in me. And the life I now live in the flesh I live by faith in the Son of God, who loved me and gave himself for me.
Salvation is a done deal.