FILL: title (e.g. "Migrate v3 → v4")

FILL: one-line framing. Legend below.

S/M/L effort low   med   high risk
  1. 01
    FILL: step name
    FILL: one-line detail / command.
    L breaking
  2. 02
    FILL: step name
    FILL: one-line detail / command.
    S safe