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, 32 deletions

diff --git a/internal/storage/db_test.go b/internal/storage/db_test.go
index 5f786ac..d28a4a8 100644
--- a/internal/storage/db_test.go
+++ b/internal/storage/db_test.go
@@ -733,35 +733,3 @@ func TestListRecentExecutions_LargeDataset(t *testing.T) {
 	})
 }
 
-func TestGetTask_BackwardCompatibility(t *testing.T) {
-	db := testDB(t)
-	now := time.Now().UTC().Truncate(time.Second)
-
-	// Legacy config JSON using "claude" field instead of "agent"
-	legacyConfig := `{"claude":{"model":"haiku","instructions":"legacy instructions","max_budget_usd":0.5}}`
-
-	_, err := db.db.Exec(`
-		INSERT INTO tasks (id, name, description, config_json, priority, timeout_ns, retry_json, tags_json, depends_on_json, state, created_at, updated_at)
-		VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
-		"legacy-id", "Legacy Task", "A legacy test", legacyConfig, "normal",
-		0, "{}", "[]", "[]", "PENDING", now, now,
-	)
-	if err != nil {
-		t.Fatalf("inserting legacy task: %v", err)
-	}
-
-	got, err := db.GetTask("legacy-id")
-	if err != nil {
-		t.Fatalf("getting legacy task: %v", err)
-	}
-
-	if got.Agent.Instructions != "legacy instructions" {
-		t.Errorf("instructions: want 'legacy instructions', got %q", got.Agent.Instructions)
-	}
-	if got.Agent.Model != "haiku" {
-		t.Errorf("model: want 'haiku', got %q", got.Agent.Model)
-	}
-	if got.Agent.MaxBudgetUSD != 0.5 {
-		t.Errorf("budget: want 0.5, got %f", got.Agent.MaxBudgetUSD)
-	}
-}