Prevent output publication after cancellation

internal/app/prompt_generate.go

@@ -2,6 +2,7 @@ package app
 
 import (
 	"context"
+	"errors"
 	"fmt"
 
 	"gitea.maximumdirect.net/eric/weatherreporter/internal/briefing"
@@ -169,6 +170,9 @@ func (w *promptReportWorkflow) renderAndPublish(raw []byte) (*ReportResult, erro
 	if err != nil {
 		return w.result, w.reportError("render template", err)
 	}
+	if err := publicationContextError(w.ctx); err != nil {
+		return w.result, w.reportError("publish report", err)
+	}
 	if err := fileutil.WriteFileAtomic(w.req.OutputPath, rendered); err != nil {
 		return w.result, err
 	}
@@ -195,6 +199,16 @@ func classifiedPromptError(operation string, err error) error {
 	return promptexec.NewError(promptexec.Generation, operation, err)
 }
 
+func publicationContextError(ctx context.Context) error {
+	if err := ctx.Err(); err != nil {
+		if errors.Is(err, context.DeadlineExceeded) {
+			return promptexec.NewError(promptexec.DeadlineExceeded, "context expired before output publication", err)
+		}
+		return promptexec.NewError(promptexec.Canceled, "context canceled before output publication", err)
+	}
+	return nil
+}
+
 func promptDebugWriteError(err error) error {
 	return promptexec.NewError(promptexec.InvalidConfiguration, "write requested prompt debug artifact", err)
 }