importance
Importance of this derivation (0.0 to 1.0).
Orthogonal to confidence: a fact can be uncertain yet critical, or certain yet trivial. Importance measures how much this fact matters to remember.
1.0: Critical (health events, safety-critical info, deadlines)
0.5: Moderate (professional details, ongoing projects)
0.0: Trivial (casual observations, small talk)