Brain Observability Bus

Single source of truth for everything the user might want to see Brain do.

• [BrainEvent] formalises every consequential moment in the signal lifecycle (received, classified, routed, executed, audited, budget-crossed, etc.).
• [Observer] is the trait every consequential code path publishes through.
• [BroadcastObserver] is the default in-process fanout implementation.
• [Redactor] scrubs vault-marked secrets from any event payload before publication.

The crate is intentionally self-contained — it owns no I/O or persistence; wiring into crates/signal and crates/audit happens at the processor seam.