Trace event causality

Get the full causality context for an event in a single API call.

Returns:

• ancestors: Parent chain from root to this event's parent
• children: Direct child events caused by this event
• retryChain: Original event and all retry attempts
• anomalies: Detected anomalies linked to this event
• summary: Quick stats (counts, hasFailures flag)

Query Parameters:

• format=tree - Returns ASCII tree output for CLI/support tickets

This is the primary debugging endpoint for tracing errors through the ledger.

Example use case: Customer reports "my run failed at step 5"

GET /v1/events/{failingEventId}/trace
GET /v1/events/{failingEventId}/trace?format=tree

Returns the complete context: what led to this event, what it triggered, whether it was retried, and any anomalies detected.