Save working context. Captures git state, decisions made, and remaining work
so any future session can pick up without losing a beat.
Use when asked to "save progress", "save state", "context save", or
"save my work". Pair with /gstack-context-restore to resume later.
Formerly /checkpoint — renamed because Claude Code treats /checkpoint as a
native rewind alias in current environments, which was shadowing this skill.
(gstack)
