Refresh PR

Reconcile an open PR's title and body against the current diff, so the body describes what the branch actually ships now — not what it shipped when it was opened. Run when the body has drifted: more commits landed, scope grew or shifted, the title still reads docs: but the PR now ships a feature.

Refresh is operator-triggered, never commit-triggered. Auto-refreshing after every iteration commit churns the body and wastes reviewer attention.

Repository conventions come from .tailrocks/pr.md when present — format and precedence are defined with tailrocks-create-pr, whose body mechanics this skill shares. Its ## Body section may name a template or a generator command whose stdout is the fresh skeleton for the current diff.

Boundaries