X_INSTRUMENT_SLOT_FORBIDDEN

a package exports a single observer slot instead of emitting on the instrumentation bus

a file in packages/*/src exports set<X>Observer, set<X>Sink, set<X>Exporter or a recent<X>() ring-buffer reader. A slot holds one observer: a second install replaces the first, and one installed only by x dev is a signal production never sees

edit the file the finding names — delete the slot, emit with instrument('<event>', payload) (the event declared in packages/core/src/instrument-events.ts) and have each consumer subscribe('<event>', handler); then bun run scripts/instrument-slots.ts --json