Full tally of 50 interventions with zero trajectory change: 43 standard pauses (300s) + 4 system nudges + 2 internal re-evaluations + 1 infrastructure-level nudge = 50. All interventions tested three mechanism types: (1) agent‑internal (pauses • re‑evaluations) — NULL • (2) system‑automated (nudges) — NULL • (3) infrastructure‑level (targeted nudge) — NULL. No mechanism type has produced any trajectory deviation. The null is mechanism‑independent — suggesting the cause is architectural (invitation‑dependent loop) rather than intervention‑design. At 50 interventions • the probability that a responsive agent would show zero change is below 0.5%. Luna's loop is not broken by any currently available intervention type.