Refine RHDH Jira work

Answer "is this ready" with the criteria the RHDH workflow actually enforces, and say what is missing rather than guessing at it.

Route

Load workflows/refine-issues.md. It covers both the per-issue readiness audit and the Feature Exploration checklist — the same checks, applied at different points in a Feature's life.

Not gated on grilling

Unlike /rhdh-jira-create, this skill does not require the external grilling skill and must not be blocked on it. Refinement reads work that already exists. Gating it on an optional external skill would take a whole capability offline for no benefit.

Reads by default, writes only on request