fix: 6 bugs (timeline path value, seer SSE cursor, erasure checksum, subtle compare, build status code, dead WorkerName branch)

internal/court/seer.go

@@ -98,7 +98,7 @@ func (h *SeerHub) fetchEvents(ctx context.Context, since string) ([]SeerEvent, e
 // TimelineHandler serves LOTL timeline merged with court events for a host.
 func TimelineHandler(c *Court) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
-		hostID := r.PathValue("host_id")
+		hostID := r.PathValue("id")
 		if hostID == "" {
 			http.Error(w, "host_id required", http.StatusBadRequest)
 			return