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feat(plan): a fifth status, for work that is not being pursued master

`declined` sits beside shipped, open, blocked and continuous, with a Not pursued table of its own. It is not `blocked`, which is waiting, and it is not an epic that has drifted to the bottom of the order: it is a question somebody could reasonably ask, answered no. Until now the register had nowhere to put an answer, so a reason lived in whichever epic happened to be adjacent to it, or nowhere at all. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>