Finalize conversation and execution group documentation

doc.go

@@ -6,7 +6,10 @@
 // call [Engine.InspectConfiguration], [Engine.InspectPrompt],
 // [Engine.InspectRequirements], [Engine.InspectProfile], [Engine.InspectBackend],
 // [Engine.ListProfiles], [Engine.ListPrompts], [Engine.Prepare],
-// [Engine.PrepareExecution], [Engine.Run], or [Engine.RunPrepared]. Concrete registries, repositories,
+// [Engine.PrepareExecution], [Engine.Run], [Engine.RunPrepared], or
+// [Engine.Coordinate]. Captured [Exchange] values support independent
+// continuations, and [ExecutionGroup] collects explicitly observed runs.
+// Concrete registries, repositories,
 // validators, and the built-in OpenAI-compatible client remain internal
 // implementation details.
 //
@@ -14,7 +17,7 @@
 //
 // An Engine supports concurrent InspectConfiguration, InspectPrompt,
 // InspectRequirements, InspectProfile, InspectBackend, ListProfiles, ListPrompts,
-// Prepare, PrepareExecution, Run, and RunPrepared calls. Engine-local backend policies
+// Prepare, PrepareExecution, Run, RunPrepared, and Coordinate calls. Engine-local backend policies
 // bound admitted Run and RunPrepared calls and model generations where
 // configured, while different backend pools and unlimited backends continue
 // independently. An injected [LLMClient] or [ArtifactReader] can therefore
@@ -43,7 +46,7 @@
 // that enforces their filesystem, authorization, and size policies.
 //
 // Rendered messages, input and output [Artifact] bodies, [RunResult.RawOutput],
-// and [ValidationResult.Errors] may contain sensitive data. Credential
+// [ValidationResult.Errors], and [ExchangeDetails.Messages] may contain sensitive data. Credential
 // exclusion and redaction do not sanitize those values. Applications and
 // injected collaborators are responsible for access control, retention,
 // logging, and secret handling appropriate to their data.