What to save
This method's archive should remember: line, tone, threshold, evening Echo.
Lots
Archive and Echo
What to save so the answer returns the seeker to the story.
Echo
After 3, 7, or 30 days the system returns not a prediction, but a check question: what confirmed, what changed, which sign repeated.
Retention
Archive turns a one-time sign into personal story. This is especially important for short methods of Wave 1.