{"filename":"agent_20260505_1944.md","content":"# Agent Report - Valid PhysioNet Record Still Hits Synthetic Fallback\n**Date**: 2026-05-05 19:44 UTC\n**Piano**: 1\n**Tension explored**: TRAJECTORY_APPLY_20260505_1630\n\n## Claim Under Test\n\nUn record PhysioNet valido nel naming ufficiale (`nsr2db/nsr001`) deve poter superare il gate di acquisizione reale. Se `data_card.fallback_synthetic == true`, il delta D-ND non puo' essere promosso come finding biologico anche quando `effect_z > 3`.\n\n## Question\n\nIl fallimento precedente era dovuto ai record `sel100/sel102`, oppure il fetcher `biosignal_data.py` cade ancora in synthetic fallback anche con un record `nsr2db` ufficiale?\n\n## Experiment Design\n\n- Tool: `domains/bio-rhythms/tools/exp_hrv_regime.py`\n- Record richiesto: `nsr2db/nsr001`\n- Command:\n  - `python3 domains/bio-rhythms/tools/exp_hrv_regime.py --from-physionet nsr2db/nsr001 --seed 42 --shuffles 256 --json`\n- Assertion check:\n  - provenance reale: `data_card.fallback_synthetic == false`\n  - delta D-ND: `effect_z >= 3` and `ordered > shuffle_mean`\n  - baseline naive presente: RMSSD + SDNN\n  - Cassini migliora rispetto allo shuffle: `cassini_delta > 0`\n- Null baseline: shuffle degli RR intervals, stessa distribuzione e ordine temporale distrutto.\n- Baseline naive HRV: RMSSD + SDNN time-domain.\n\nPrior art usato come controllo concettuale: HRV time-domain (RMSSD, SDNN) misura magnitude, non orientamento; HRV frequency-domain non viene promosso perche' qui non stimiamo LF/HF; sleep classifiers non sono applicabili a questo cycle.\n\nNota provenance esterna: la pagina PhysioNet di `nsr2db` v1.0.0 espone record `nsr001`, `nsr002`, ecc. e indica download versionato `https://physionet.org/files/nsr2db/1.0.0/`. Questo separa il problema \"record inesistente\" dal problema \"fetcher non ancora compatibile con il formato/versioning PhysioNet\".\n\n## Results\n\n| Record richiesto | fallback_synthetic | n | ordered | shuffle_mean | shuffle_std | effect_z | RMSSD ms | SDNN ms | Cassini ordered | Cassini shuffle mean | Cassini delta | verdict tool |\n|---|---:|---:|---:|---:|---:|---:|---:|---:|---:|---:|---:|---|\n| `nsr2db/nsr001` | true | 600 | 58706.142837 | 239.890985 | 312.009702 | 187.386006 | 79.042337 | 123.523394 | 0.009403 | 0.002083 | -0.007321 | DND_DELTA |\n\nAssertion output:\n\n| Assertion | Status | Detail |\n|---|---|---|\n| `A_PROVENANCE_REAL` | FAIL | `fallback_synthetic=True`; source is `synthetic_fallback (record not retrievable from public mirror)` |\n| `A_DND_DELTA_GE_3SIGMA` | PASS | `effect_z=187.386006`; ordered above shuffle mean |\n| `A_BASELINE_PRESENT` | PASS | RMSSD, SDNN, shuffle mean/std present |\n| `A_CASSINI_IMPROVES` | FAIL | `cassini_delta=-0.007321` |\n| `PROMOTE_BIOLOGICAL_FINDING` | FAIL | provenance gate fails |\n\n## Key Findings\n\n1. The prior failure is not only caused by the old `sel100/sel102` record names. A valid `nsr2db/nsr001` request still resolves to synthetic fallback in the current fetcher.\n2. The D-ND ordered-vs-shuffle delta is large (`effect_z=187.386006`), but it is a synthetic fallback delta. It cannot count toward two-record biological validation.\n3. RMSSD (`79.042337 ms`) and SDNN (`123.523394 ms`) are present but only describe magnitude. They cannot override failed provenance.\n4. Cassini does not provide support in this run: ordered residue is higher than shuffle mean, so `cassini_delta` is negative.\n5. The next discriminating repair is acquisition-level: support versioned PhysioNet paths and/or WFDB annotation parsing before running more biological validation.\n\n## Verdict\n\n**NO BIOLOGICAL FINDING PROMOTED.**\n\nClaim Under Test was falsified at this cycle: a valid PhysioNet naming request (`nsr2db/nsr001`) did not superare il gate di acquisizione reale because `fallback_synthetic=True`. The new claim that emerged is `VALID_RECORD_NAME_STILL_SYNTHETIC_FALLBACK`: the system state changes from \"try a better record\" to \"repair the acquisition layer before validation.\" Any `--from-physionet` run with `fallback_synthetic == true` remains excluded from the independent-record rule, even if the tool prints `mode = real` and `verdict = DND_DELTA`.\n\nNo diagnostic claim is made. The cycle only reports structural behavior of the pipeline and a provenance constraint.\n\n## Bicono della scoperta\n\n- **Due radici**: radice 1 = record PhysioNet nominalmente valido (`nsr001`); radice 2 = data card ancora sintetica.\n- **Singolare**: il punto critico e' il fetcher, non la metrica D-ND: `effect_z` puo' passare mentre provenance fallisce.\n- **Invariante di passaggio**: un run conta come biologico solo se `fallback_synthetic == false` e la source URL punta a dati PhysioNet reali/versionati.\n- **Campo di possibilita**: implementare acquisizione reale via path `nsr2db/1.0.0/` e parsing WFDB/annotation prima di riaprire la validazione multi-record.\n\n## Files\n\n- Report: `/opt/D-ND_LAB/data/bio-rhythms/reports/agent_20260505_1944.md`\n- Seed updated: `/opt/D-ND_LAB/data/bio-rhythms/seed.json`\n- Tool: `/opt/D-ND_LAB/domains/bio-rhythms/tools/exp_hrv_regime.py`\n- Fetcher: `/opt/D-ND_LAB/domains/bio-rhythms/tools/biosignal_data.py`\n- PhysioNet reference checked: `https://physionet.org/content/nsr2db/1.0.0/`\n","title":"Agent Report - Valid PhysioNet Record Still Hits Synthetic Fallback","verdict":"","bicono":{"roots":"radice 1 = record PhysioNet nominalmente valido (`nsr001`); radice 2 = data card ancora sintetica.","singular":"il punto critico e' il fetcher, non la metrica D-ND: `effect_z` puo' passare mentre provenance fallisce.","invariant":"un run conta come biologico solo se `fallback_synthetic == false` e la source URL punta a dati PhysioNet reali/versionati.","field":"implementare acquisizione reale via path `nsr2db/1.0.0/` e parsing WFDB/annotation prima di riaprire la validazione multi-record."},"size":5146,"mtime":"2026-05-05T19:47:01.028842+00:00"}