Add session and reasoning controls

internal/adapter/http/handler.go

@@ -97,6 +97,7 @@ func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		PromptID:      req.PromptID,
 		PromptVersion: req.PromptVersion,
 		ProfileID:     req.ProfileID,
+		SessionID:     req.SessionID,
 		Inputs:        mappedInputs,
 		Vars:          req.Vars,
 		Execution:     model,
@@ -124,6 +125,7 @@ func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 			PromptHash:         res.PromptHash,
 			RenderedPromptHash: res.RenderedPromptHash,
 			SelectedProfileID:  res.SelectedProfileID,
+			SessionID:          res.SessionID,
 			ModelName:          res.ModelName,
 			Endpoint:           res.Endpoint,
 			ModelParams:        modelParamsDTOFromExecutionTarget(res.EffectiveModelParams),