Report actual inference smoke test destinations

internal/generation/evidence.go

@@ -10,9 +10,12 @@ import (
 // GenerationEvidence contains invocation-local request evidence without raw
 // provider bodies, headers, credentials, or generated content.
 type GenerationEvidence struct {
-	Attempts    []AttemptEvidence
-	RetryDelays []time.Duration
-	Usage       domain.ObservedTokenUsage
+	// InitialEndpoint is the frozen built-in request URL, if prepared.
+	// Injected generation leaves it unknown.
+	InitialEndpoint string
+	Attempts        []AttemptEvidence
+	RetryDelays     []time.Duration
+	Usage           domain.ObservedTokenUsage
 }
 
 // AttemptEvidence describes one capacity acquisition and any dispatch it