decision-hold-lifecycle (renamed)

The separate decision concept was collapsed into the one primitive the captain cares about: a task held for the captain. Read and follow .agents/skills/captain-hold-lifecycle/SKILL.md; it owns the completion gate, the recorded-answer rule, and every command this skill used to describe. Where an older brief says bin/fm-decision-hold.sh, that command still works as a one-release compatibility shim over bin/fm-captain-hold.sh.