Carry evidence through built-in generation retries

internal/generation/evidence.go

@@ -0,0 +1,38 @@
+package generation
+
+import (
+	"time"
+
+	"gitea.maximumdirect.net/eric/promptkit/internal/domain"
+	"gitea.maximumdirect.net/eric/promptkit/internal/llm"
+)
+
+// 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
+}
+
+// AttemptEvidence describes one capacity acquisition and any dispatch it
+// reached. Generated content remains on the separate response return value.
+type AttemptEvidence struct {
+	Dispatched                bool
+	HTTP                      llm.HTTPExecutionEvidence
+	CapacityWait              time.Duration
+	RequestDuration           time.Duration
+	Failure                   domain.ExecutionFailureKind
+	Usage                     domain.ObservedTokenUsage
+	ResponseDecoded           bool
+	GenerationCompleted       bool
+	StructuredOutputRequested *bool
+}
+
+func cloneHTTPEvidence(evidence llm.HTTPExecutionEvidence) llm.HTTPExecutionEvidence {
+	if evidence.HTTPStatus != nil {
+		status := *evidence.HTTPStatus
+		evidence.HTTPStatus = &status
+	}
+	return evidence
+}