diff --git a/registry/phase4ar-normal-conditioning-active/phase4ar-first-arm-resource-observation.json b/registry/phase4ar-normal-conditioning-active/phase4ar-first-arm-resource-observation.json
new file mode 100644
index 0000000..39998ac
--- /dev/null
+++ b/registry/phase4ar-normal-conditioning-active/phase4ar-first-arm-resource-observation.json
@@ -0,0 +1,65 @@
+{
+  "schema": "phase4ar-readonly-resource-observation-v1",
+  "observed_utc": "2026-09-30T13:47:22.980Z",
+  "registration_sha256": "b63e6281b6505ca3b60acb467dd0b3fae274cf513dcbfd653649ba52e9ba9740",
+  "ledger_entries_at_snapshot": 252,
+  "ledger_head_sha256": "5080e2a2096ed9ef7b4c464d614127c641915a54fe57d45fa9ba053d55d118d1",
+  "coverage": {
+    "training_epochs_completed": 79,
+    "probes_completed": 12,
+    "additional_training_epoch_partially_committed": 1,
+    "mode": "physiological",
+    "DAN_type": "PAM15",
+    "reinforced_cue": "A",
+    "replicate": 1,
+    "arm": "paired"
+  },
+  "recorded_timing_seconds": {
+    "complete_training_receipt_sum_mean": 20.02755,
+    "complete_training_receipt_sum_median": 20.02961,
+    "complete_training_receipt_sum_min": 19.90712,
+    "complete_training_receipt_sum_max": 20.14124,
+    "brain_receipt_mean": 9.25220,
+    "update_receipt_mean": 6.29414,
+    "CPU_verify_receipt_mean": 4.48121,
+    "consecutive_training_completion_interval_mean": 24.05616,
+    "consecutive_training_intervals_without_interleaved_probe": 73,
+    "warm_probe_receipt_mean": 9.25613,
+    "warm_probe_count": 11,
+    "warm_probe_completion_interval_mean": 10.60227,
+    "first_cold_probe_receipt": 67.32627,
+    "first_probe_build_cache_time": 58.69004,
+    "scope": "Receipt timers exclude ledger append and next-trial preparation; outer completion intervals include that overhead. Cold build counted separately."
+  },
+  "accounting_at_snapshot_bytes": {
+    "committed_payload": 388209042,
+    "ledger": 7899092,
+    "shared_build": 1716897,
+    "total": 397825031,
+    "initial_prepared": 110263141,
+    "one_time_input_generation": 23713320,
+    "training_payload_mean": 2779233,
+    "probe_payload_mean": 2657640,
+    "training_payload_first20_mean": 2781387,
+    "training_payload_last20_mean": 2778237,
+    "training_payload_min": 2734504,
+    "training_payload_max": 2813710
+  },
+  "rough_linear_scenario_not_guaranteed": {
+    "full_execution_days_using_outer_intervals": 8.835,
+    "receipt_only_days_underestimates_overhead": 7.375,
+    "full_output_GiB": 89.213,
+    "registered_output_cap_GiB": 256,
+    "registered_workflow_limit_days": 21,
+    "disk_free_GiB_at_snapshot": 603.498,
+    "registered_disk_reserve_GiB": 100,
+    "other_arms_DAN_modes_event_counts_and_compression_not_measured": true
+  },
+  "source_scope": "Committed ledger/started metadata and each bound process receipt SHA; task identity only from results; timing only from run summaries. Not a full artifact integrity audit.",
+  "raw_spikes_states_or_delta_arrays_read": false,
+  "scientific_metrics_evaluated": false,
+  "learning_success_claimed": false,
+  "registered_budget_changed": false,
+  "model_or_input_changed": false,
+  "recommendation": "Keep the already registered plan and limits; continue monitoring actual resource use."
+}