feat: acceptance_criteria per story task in elaboration and approval

Add AcceptanceCriteria field to elaboratedStoryTask struct, update
buildStoryElaboratePrompt schema and rules, pass the value through
handleApproveStory into task.Task, and add a test verifying the
field is persisted on approved story tasks.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 14 insertions, 13 deletions

diff --git a/internal/api/stories.go b/internal/api/stories.go
index 1743dbe..fa10ccd 100644
--- a/internal/api/stories.go
+++ b/internal/api/stories.go
@@ -254,19 +254,20 @@ func (s *Server) handleApproveStory(w http.ResponseWriter, r *http.Request) {
 	var prevTaskID string
 	for _, tp := range input.Tasks {
 		t := &task.Task{
-			ID:            uuid.New().String(),
-			Name:          tp.Name,
-			Project:       input.ProjectID,
-			RepositoryURL: repoURL,
-			StoryID:       story.ID,
-			Agent:         task.AgentConfig{Type: "claude", Instructions: tp.Instructions},
-			Priority:      task.PriorityNormal,
-			Tags:          []string{},
-			DependsOn:     []string{},
-			Retry:         task.RetryConfig{MaxAttempts: 1, Backoff: "exponential"},
-			State:         task.StatePending,
-			CreatedAt:     time.Now().UTC(),
-			UpdatedAt:     time.Now().UTC(),
+			ID:                 uuid.New().String(),
+			Name:               tp.Name,
+			Project:            input.ProjectID,
+			RepositoryURL:      repoURL,
+			StoryID:            story.ID,
+			Agent:              task.AgentConfig{Type: "claude", Instructions: tp.Instructions},
+			AcceptanceCriteria: tp.AcceptanceCriteria,
+			Priority:           task.PriorityNormal,
+			Tags:               []string{},
+			DependsOn:          []string{},
+			Retry:              task.RetryConfig{MaxAttempts: 1, Backoff: "exponential"},
+			State:              task.StatePending,
+			CreatedAt:          time.Now().UTC(),
+			UpdatedAt:          time.Now().UTC(),
 		}
 		if prevTaskID != "" {
 			t.DependsOn = []string{prevTaskID}