Add lossless training data

.gitattributes

@@ -61,3 +61,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 synthetic/tasks/task-04/units/unit-00216/packed/unit-00216-00000.blob filter=lfs diff=lfs merge=lfs -text
 synthetic/metadata.json filter=lfs diff=lfs merge=lfs -text
 recorded/shards/shard-00/manifest.sqlite filter=lfs diff=lfs merge=lfs -text
+recorded/shards/shard-01/manifest.sqlite filter=lfs diff=lfs merge=lfs -text

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recorded/shards/shard-01/COMPLETE.json

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+{
+  "assets": 42,
+  "dataset_schema": "recorded_natural_score_scene_freeze_v1",
+  "kind_counts": {
+    "recorded_natural_score_exact_stems_v1": 42
+  },
+  "payload_bytes": 45291347,
+  "scenes": 42,
+  "schema": "packed_blob_shards_v1",
+  "shards": [
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+      "shard": "scenes-00000.blob"
+    }
+  ],
+  "status": "staged"
+}

recorded/shards/shard-01/FROZEN.json

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+{
+  "admission_status": "canary_only_pending_final_eval_dedup_ledger",
+  "audit": {
+    "path": "/scratch/gilbreth/chou150/scns_v3/materialization/train_v3_plan11711692_packed_v1/shard-01/audit_report.json",
+    "sha256": "01762a82e84438a07da474d4ef51fd14c3bf20c175913a01cd91e83b3341fd66"
+  },
+  "bindings": {
+    "builder": {
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+      "sha256": "7dc526294206f9dc8bf022cc70dd1a39cff8b4c70cc57dea89e1964514728b56"
+    },
+    "preregistration": {
+      "path": "/scratch/gilbreth/chou150/scns_v3/authorities/train_v3_boundroot_full_v3_20260909/code_snapshots/job11711692/preregister_scns_train_v3_boundroot_full_v3_20260909.md",
+      "sha256": "247083119d19b3f0af36379678f5ba0867286e3addaa5c4dbd1f40c5b16937c4"
+    },
+    "recorded_freeze": {
+      "path": "/scratch/gilbreth/chou150/scns_v3/source_lanes/scns_train_v3_isolated_union_20260908/FROZEN.json",
+      "sha256": "f074d9040485c7f6deb6d8ceef2e5f485ec8db27aa75cba14808cef056a48792"
+    },
+    "score_freeze": {
+      "path": "/scratch/gilbreth/chou150/scns_v3/authorities/slakh_score_authority_v1_20260908/FROZEN.json",
+      "sha256": "0c52a81b26f8ae8b48e882425f341641f7b85bec1857c810a3f89c1fe3a6fa96"
+    }
+  },
+  "final_admission_blocker": "Missing calibrated SCNS+ARP+PDMX source-parent and acoustic near-duplicate ledger.",
+  "manifest": {
+    "path": "/scratch/gilbreth/chou150/scns_v3/materialization/train_v3_plan11711692_packed_v1/shard-01/scenes.jsonl",
+    "rows": 42,
+    "sha256": "eefe7c0ecd6da141ef8693168af9111162bf95d86d27b4c217e0d58b7a92068d"
+  },
+  "mixture_contract": "load packed float32 [K,L] stems and sum once; mixture is not stored",
+  "output_root": "/scratch/gilbreth/chou150/scns_v3/materialization/train_v3_plan11711692_packed_v1/shard-01",
+  "packed_index": {
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+    "sha256": "80db1f785ddfe3d48b34f0e13436cdc2fc8292f8fac38404e2d0408a157136f1"
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+  "plan": {
+    "path": "/scratch/gilbreth/chou150/scns_v3/materialization/train_v3_plan11711692_shards_v1/plan-shard-01.json",
+    "sha256": "0efdf76d66135977d30137bd557faeb25d16547bb7149cfd6aa761ea721e7188"
+  },
+  "schema": "recorded_natural_score_scene_freeze_v1",
+  "seed": 20260908,
+  "source_contract": {
+    "duration_policy": "closest_resampled_native_duration; no looping_or_time_stretching",
+    "endpoint_policy": "acoustic_offset_is_tail_energy_q995_within_source_or_score_plus_0.5s_cosine_release_cap; nominal_score_midi_offset_retained_separately",
+    "ensemble_palette": "strict_family_palette: bowed_strings={strings,bass}; winds={reed,pipe}; brass={brass}; guitars={guitar}; piano={piano}",
+    "pitch_policy": "nearest_native_root_within_2_semitones; sampler_style_resampling; uncovered score events are omitted",
+    "required_lane_single_track_fallback": true,
+    "score_piece_split_policy": "deterministic_piece_hash",
+    "score_split": "validation pieces selected first and reserved before train selection",
+    "score_structure": "paired compatible real-score tracks by default; required lanes with candidates but zero structural pairs may use one complete real score track",
+    "source_group_balance": "score-coverage-first least-used physical source group tie-break; optional hard per-group scene cap",
+    "source_split": "shared_source_groups; exact clips unique; external_eval_source_package_disjointness_required",
+    "supplemental_instrument_coverage": "one train scene per declared canonical instrument; priority ceases after coverage",
+    "supplemental_lane_coverage": "one train scene per declared lane; priority ceases after coverage",
+    "supplemental_library_coverage": "one train scene per declared library; priority ceases after coverage",
+    "track_source_binding": "one recorded source group is fixed for every selected score track",
+    "training_score_piece_variants": "at most the declared number of exact-source-group-pair-distinct training scenes per score piece; validation score pieces remain single-use and excluded from training"
+  },
+  "status": "passed"
+}

recorded/shards/shard-01/audit_report.json

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+{
+  "duration_transform": "bounded_sampler_style_root_playback_resample",
+  "endpoint_contract": "acoustic_offsets_are_tail_energy_q995_within_score_plus_cosine_release_caps",
+  "maximum_closure_error": 0.0,
+  "omission_contract": "uncovered_score_events_are_omitted_and_recorded_in_scene_metadata",
+  "scenes": 42,
+  "schema": "scns_real_score_raw_note_audit_v1",
+  "source_group_split_overlap": 7,
+  "status": "passed",
+  "stems": 426,
+  "validation_source_policy": "shared_source_groups_score_piece_disjoint"
+}

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