Collect-phase probes recover from poison; no-storage bindings claim statement declarators only

- The ambient-trap probe resolves as a side-effect-free probe: deferred collection diagnostics stay deferred, and the merged-namespace fence lands as a diagnostic instead of crashing the collect walk
- deadUnmappableBinding and the nullish family claim statement-position declarators only; for-init heads and catch bindings stay locals
- Trap classification declines written bindings; the seven 0.0.10 pass-to-fail fences restore byte-identical to 0.0.9 behavior