fix: cancel waiting tasks when dep hits terminal failure (QUEUED→CANCELLED)

QUEUED→FAILED is not a valid state transition. When a dependency enters a
terminal failure state, cancel the waiting task instead.

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

1 files changed, 4 insertions, 4 deletions

diff --git a/internal/executor/executor.go b/internal/executor/executor.go
index d2b476a..6aef736 100644
--- a/internal/executor/executor.go
+++ b/internal/executor/executor.go
@@ -777,21 +777,21 @@ func (p *Pool) execute(ctx context.Context, t *task.Task) {
 	if len(t.DependsOn) > 0 {
 		ready, depErr := p.checkDepsReady(t)
 		if depErr != nil {
-			// A dependency hit a terminal failure — fail this task immediately.
+			// A dependency hit a terminal failure — cancel this task immediately.
 			now := time.Now().UTC()
 			exec := &storage.Execution{
 				ID:        uuid.New().String(),
 				TaskID:    t.ID,
 				StartTime: now,
 				EndTime:   now,
-				Status:    "FAILED",
+				Status:    "CANCELLED",
 				ErrorMsg:  depErr.Error(),
 			}
 			if createErr := p.store.CreateExecution(exec); createErr != nil {
 				p.logger.Error("failed to create execution record", "error", createErr)
 			}
-			if err := p.store.UpdateTaskState(t.ID, task.StateFailed); err != nil {
-				p.logger.Error("failed to update task state", "taskID", t.ID, "state", task.StateFailed, "error", err)
+			if err := p.store.UpdateTaskState(t.ID, task.StateCancelled); err != nil {
+				p.logger.Error("failed to update task state", "taskID", t.ID, "state", task.StateCancelled, "error", err)
 			}
 			p.resultCh <- &Result{TaskID: t.ID, Execution: exec, Err: depErr}
 			return