{
 "format": "tierline-demo-reference-run-v1",
 "generated_at": "2026-10-13T22:35:50Z",
 "generator": "scripts/run_demo_reference_search.py",
 "evidence_class": "exercised",
 "evidence_note": "Real XLS-R reference-engine execution over the site's example recordings (short public-domain excerpts of real English speech). Not a benchmark and not a measurement of accuracy on any language or collection.",
 "git_commit": "faf983def45fc881e34c406707146920d60fcd31",
 "git_dirty": false,
 "git_dirty_paths": [],
 "git_dirty_note": "git status --porcelain (untracked included) at run time, excluding the output file itself.",
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  "cpu": "Intel(R) Xeon(R) Processor @ 2.80GHz",
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  "numpy": "2.5.4",
  "scikit_learn": "1.9.1",
  "ffmpeg": "ffmpeg version 6.1.1-3ubuntu5 Copyright (c) 2000-2023 the FFmpeg developers"
 },
 "model": {
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  "revision": "1a640f32ac3e39899438a2931f9924c02f080a54",
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  "manifest_sha256_note": "SHA-256 of the manifest.json file bytes; asset_manifest_sha256 is the self-authenticating asset digest Tierline registers and binds features to.",
  "asset_manifest_sha256": "93afb4d26171586e47fcb49875bb4093c2cabde995ee742960aeb10e26cb816c",
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  "coarse": "HNSW32_SQ8 (+ Flat exact)",
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 },
 "policy": {
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  "purposes": [
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   "roles": [
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 },
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 "timing_note": "elapsed_ms is one wall-clock measurement of the full search call (stored query frames, FAISS index load and integrity checks, coarse search, DTW, NMS, SQLite persistence) on this CPU; engine_latency_ms is the engine-recorded coarse+rerank time. No warm-up, no repetition; not a latency benchmark.",
 "catalog_same_opening_sentence_note": "Derived from catalog transcripts (identical first sentence). Whether the query span covers exactly that sentence is not verified; context only, not a relevance label.",
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}