Remove legacy claude field and working_dir backward compat

- Remove Claude field alias from Task struct (already removed in sandbox)
- Remove UnmarshalJSON from AgentConfig that silently accepted working_dir
- Remove legacy claude fallback in scanTask (db.go)
- Remove TestGetTask_BackwardCompatibility test that validated removed behavior

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

1 files changed, 0 insertions, 9 deletions

diff --git a/internal/storage/db.go b/internal/storage/db.go
index 835ac29..31d38ed 100644
--- a/internal/storage/db.go
+++ b/internal/storage/db.go
@@ -519,15 +519,6 @@ func scanTask(row scanner) (*task.Task, error) {
 	if err := json.Unmarshal([]byte(configJSON), &t.Agent); err != nil {
 		return nil, fmt.Errorf("unmarshaling agent config: %w", err)
 	}
-	// Fallback for legacy 'claude' field
-	if t.Agent.Instructions == "" {
-		var legacy struct {
-			Claude task.AgentConfig `json:"claude"`
-		}
-		if err := json.Unmarshal([]byte(configJSON), &legacy); err == nil && legacy.Claude.Instructions != "" {
-			t.Agent = legacy.Claude
-		}
-	}
 	if err := json.Unmarshal([]byte(retryJSON), &t.Retry); err != nil {
 		return nil, fmt.Errorf("unmarshaling retry: %w", err)
 	}