Reanchor

Purpose

Long-lived and resumed sessions act on stale premises: main has moved, a referenced PR merged or changed shape, a cited skill was renamed, an installed plugin shipped a new version, a locked plan references work that has since landed. Nothing re-verifies those assumptions against live reality before the session builds on them. This skill re-anchors a session's working assumptions — checks each premise its inputs depend on against the current state, reports what drifted, and hands back a corrected picture to plan from.

It verifies premises; it does not resume the work. Run it before continuing on old inputs, then hand to /session-flow:keep-going to actually pick the work back up.

What it re-anchors